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Angelopoulos V, Zhang XJ, Artemyev AV, Mourenas D, Tsai E, Wilkins C, Runov A, Liu J, Turner DL, Li W, Khurana K, Wirz RE, Sergeev VA, Meng X, Wu J, Hartinger MD, Raita T, Shen Y, An X, Shi X, Bashir MF, Shen X, Gan L, Qin M, Capannolo L, Ma Q, Russell CL, Masongsong EV, Caron R, He I, Iglesias L, Jha S, King J, Kumar S, Le K, Mao J, McDermott A, Nguyen K, Norris A, Palla A, Roosnovo A, Tam J, Xie E, Yap RC, Ye S, Young C, Adair LA, Shaffer C, Chung M, Cruce P, Lawson M, Leneman D, Allen M, Anderson M, Arreola-Zamora M, Artinger J, Asher J, Branchevsky D, Cliffe M, Colton K, Costello C, Depe D, Domae BW, Eldin S, Fitzgibbon L, Flemming A, Frederick DM, Gilbert A, Hesford B, Krieger R, Lian K, McKinney E, Miller JP, Pedersen C, Qu Z, Rozario R, Rubly M, Seaton R, Subramanian A, Sundin SR, Tan A, Thomlinson D, Turner W, Wing G, Wong C, Zarifian A. Energetic Electron Precipitation Driven by Electromagnetic Ion Cyclotron Waves from ELFIN's Low Altitude Perspective. Space Sci Rev 2023; 219:37. [PMID: 37448777 PMCID: PMC10335998 DOI: 10.1007/s11214-023-00984-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 06/28/2023] [Indexed: 07/15/2023]
Abstract
We review comprehensive observations of electromagnetic ion cyclotron (EMIC) wave-driven energetic electron precipitation using data collected by the energetic electron detector on the Electron Losses and Fields InvestigatioN (ELFIN) mission, two polar-orbiting low-altitude spinning CubeSats, measuring 50-5000 keV electrons with good pitch-angle and energy resolution. EMIC wave-driven precipitation exhibits a distinct signature in energy-spectrograms of the precipitating-to-trapped flux ratio: peaks at >0.5 MeV which are abrupt (bursty) (lasting ∼17 s, or Δ L ∼ 0.56 ) with significant substructure (occasionally down to sub-second timescale). We attribute the bursty nature of the precipitation to the spatial extent and structuredness of the wave field at the equator. Multiple ELFIN passes over the same MLT sector allow us to study the spatial and temporal evolution of the EMIC wave - electron interaction region. Case studies employing conjugate ground-based or equatorial observations of the EMIC waves reveal that the energy of moderate and strong precipitation at ELFIN approximately agrees with theoretical expectations for cyclotron resonant interactions in a cold plasma. Using multiple years of ELFIN data uniformly distributed in local time, we assemble a statistical database of ∼50 events of strong EMIC wave-driven precipitation. Most reside at L ∼ 5 - 7 at dusk, while a smaller subset exists at L ∼ 8 - 12 at post-midnight. The energies of the peak-precipitation ratio and of the half-peak precipitation ratio (our proxy for the minimum resonance energy) exhibit an L -shell dependence in good agreement with theoretical estimates based on prior statistical observations of EMIC wave power spectra. The precipitation ratio's spectral shape for the most intense events has an exponential falloff away from the peak (i.e., on either side of ∼ 1.45 MeV). It too agrees well with quasi-linear diffusion theory based on prior statistics of wave spectra. It should be noted though that this diffusive treatment likely includes effects from nonlinear resonant interactions (especially at high energies) and nonresonant effects from sharp wave packet edges (at low energies). Sub-MeV electron precipitation observed concurrently with strong EMIC wave-driven >1 MeV precipitation has a spectral shape that is consistent with efficient pitch-angle scattering down to ∼ 200-300 keV by much less intense higher frequency EMIC waves at dusk (where such waves are most frequent). At ∼100 keV, whistler-mode chorus may be implicated in concurrent precipitation. These results confirm the critical role of EMIC waves in driving relativistic electron losses. Nonlinear effects may abound and require further investigation.
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Affiliation(s)
- V. Angelopoulos
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - X.-J. Zhang
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: University of Texas at Dallas, Richardson, TX 75080 USA
| | - A. V. Artemyev
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | | | - E. Tsai
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - C. Wilkins
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - A. Runov
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - J. Liu
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Atmospheric and Oceanic Sciences Departments, University of California, Los Angeles, CA USA
| | - D. L. Turner
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland USA
| | - W. Li
- Atmospheric and Oceanic Sciences Departments, University of California, Los Angeles, CA USA
| | - K. Khurana
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - R. E. Wirz
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331 USA
| | - V. A. Sergeev
- University of St. Petersburg, St. Petersburg, Russia
| | - X. Meng
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA
| | - J. Wu
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - M. D. Hartinger
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Space Science Institute, Boulder, CO 80301 USA
| | - T. Raita
- Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland
| | - Y. Shen
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - X. An
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - X. Shi
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - M. F. Bashir
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - X. Shen
- Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA
| | - L. Gan
- Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA
| | - M. Qin
- Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA
| | - L. Capannolo
- Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA
| | - Q. Ma
- Department of Astronomy and Center for Space Physics, Boston University, Boston, MA USA
| | - C. L. Russell
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - E. V. Masongsong
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - R. Caron
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - I. He
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Materials Science and Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - L. Iglesias
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Deloitte Consulting, New York, NY 10112 USA
| | - S. Jha
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Microsoft, Redmond, WA 98052 USA
| | - J. King
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - S. Kumar
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637 USA
| | - K. Le
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Materials Science and Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - J. Mao
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Raybeam, Inc., Mountain View, CA 94041 USA
| | - A. McDermott
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - K. Nguyen
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: SpaceX, Hawthorne, CA 90250 USA
| | - A. Norris
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - A. Palla
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Reliable Robotics Corporation, Mountain View, CA 94043 USA
| | - A. Roosnovo
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Los Alamos National Laboratory, Los Alamos, NM 87545 USA
| | - J. Tam
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - E. Xie
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Deloitte Consulting, New York, NY 10112 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - R. C. Yap
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mathematics Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Planet Labs, PBC, San Francisco, CA 94107 USA
| | - S. Ye
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - C. Young
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Microsoft, Redmond, WA 98052 USA
| | - L. A. Adair
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: KSAT, Inc., Denver, CO 80231 USA
| | - C. Shaffer
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
| | - M. Chung
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - P. Cruce
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Apple, Cupertino, CA 95014 USA
| | - M. Lawson
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - D. Leneman
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
| | - M. Allen
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Zipline International, South San Francisco, CA 94080 USA
| | - M. Anderson
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mathematics Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Lucid Motors, Newark, CA 94560 USA
| | - M. Arreola-Zamora
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - J. Artinger
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: College of Engineering and Computer Science, California State University, Fullerton, Fullerton, CA 92831 USA
| | - J. Asher
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: The Aerospace Corporation, El Segundo, CA 90245 USA
| | - D. Branchevsky
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: The Aerospace Corporation, El Segundo, CA 90245 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - M. Cliffe
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: SpaceX, Hawthorne, CA 90250 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - K. Colton
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mathematics Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Planet Labs, PBC, San Francisco, CA 94107 USA
| | - C. Costello
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Heliogen, Pasadena, CA 91103 USA
| | - D. Depe
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Argo AI, LLC, Pittsburgh, PA 15222 USA
| | - B. W. Domae
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - S. Eldin
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Microsoft, Redmond, WA 98052 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - L. Fitzgibbon
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Terran Orbital, Irvine, CA 92618 USA
| | - A. Flemming
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - D. M. Frederick
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Millenium Space Systems, El Segundo, CA 90245 USA
| | - A. Gilbert
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Department of Electrical Engineering, Stanford University, Stanford, CA 94305 USA
| | - B. Hesford
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - R. Krieger
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Materials Science and Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Mercedes-Benz Research and Development North America, Long Beach, CA 90810 USA
| | - K. Lian
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: The Aerospace Corporation, El Segundo, CA 90245 USA
| | - E. McKinney
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Geosyntec Consultants, Inc., Costa Mesa, CA 92626 USA
| | - J. P. Miller
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Juniper Networks Sunnyvale, California, 94089 USA
| | - C. Pedersen
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - Z. Qu
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Niantic Inc., San Francisco, CA 94111 USA
| | - R. Rozario
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: SpaceX, Hawthorne, CA 90250 USA
| | - M. Rubly
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Teledyne Scientific and Imaging, Thousand Oaks, CA 91360 USA
| | - R. Seaton
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - A. Subramanian
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - S. R. Sundin
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Naval Surface Warfare Center Corona Division, Norco, CA 92860 USA
| | - A. Tan
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Epirus Inc., Torrance, CA 90501 USA
| | - D. Thomlinson
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: The Aerospace Corporation, El Segundo, CA 90245 USA
| | - W. Turner
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Department of Astronomy, Ohio State University, Columbus, OH 43210 USA
| | - G. Wing
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Present Address: Amazon, Seattle, WA 98109 USA
| | - C. Wong
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Department of Radiology, University of California, San Francisco, San Francisco, CA 94143 USA
| | - A. Zarifian
- Earth, Planetary, and Space Sciences Department, and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA
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Angelopoulos V, Tsai E, Bingley L, Shaffer C, Turner DL, Runov A, Li W, Liu J, Artemyev AV, Zhang XJ, Strangeway RJ, Wirz RE, Shprits YY, Sergeev VA, Caron RP, Chung M, Cruce P, Greer W, Grimes E, Hector K, Lawson MJ, Leneman D, Masongsong EV, Russell CL, Wilkins C, Hinkley D, Blake JB, Adair N, Allen M, Anderson M, Arreola-Zamora M, Artinger J, Asher J, Branchevsky D, Capitelli MR, Castro R, Chao G, Chung N, Cliffe M, Colton K, Costello C, Depe D, Domae BW, Eldin S, Fitzgibbon L, Flemming A, Fox I, Frederick DM, Gilbert A, Gildemeister A, Gonzalez A, Hesford B, Jha S, Kang N, King J, Krieger R, Lian K, Mao J, McKinney E, Miller JP, Norris A, Nuesca M, Palla A, Park ESY, Pedersen CE, Qu Z, Rozario R, Rye E, Seaton R, Subramanian A, Sundin SR, Tan A, Turner W, Villegas AJ, Wasden M, Wing G, Wong C, Xie E, Yamamoto S, Yap R, Zarifian A, Zhang GY. The ELFIN Mission. Space Sci Rev 2020; 216:103. [PMID: 32831412 PMCID: PMC7413588 DOI: 10.1007/s11214-020-00721-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]
Abstract
The Electron Loss and Fields Investigation with a Spatio-Temporal Ambiguity-Resolving option (ELFIN-STAR, or heretoforth simply: ELFIN) mission comprises two identical 3-Unit (3U) CubeSats on a polar (∼93∘ inclination), nearly circular, low-Earth (∼450 km altitude) orbit. Launched on September 15, 2018, ELFIN is expected to have a >2.5 year lifetime. Its primary science objective is to resolve the mechanism of storm-time relativistic electron precipitation, for which electromagnetic ion cyclotron (EMIC) waves are a prime candidate. From its ionospheric vantage point, ELFIN uses its unique pitch-angle-resolving capability to determine whether measured relativistic electron pitch-angle and energy spectra within the loss cone bear the characteristic signatures of scattering by EMIC waves or whether such scattering may be due to other processes. Pairing identical ELFIN satellites with slowly-variable along-track separation allows disambiguation of spatial and temporal evolution of the precipitation over minutes-to-tens-of-minutes timescales, faster than the orbit period of a single low-altitude satellite (Torbit ∼ 90 min). Each satellite carries an energetic particle detector for electrons (EPDE) that measures 50 keV to 5 MeV electrons with Δ E/E < 40% and a fluxgate magnetometer (FGM) on a ∼72 cm boom that measures magnetic field waves (e.g., EMIC waves) in the range from DC to 5 Hz Nyquist (nominally) with <0.3 nT/sqrt(Hz) noise at 1 Hz. The spinning satellites (Tspin ∼ 3 s) are equipped with magnetorquers (air coils) that permit spin-up or -down and reorientation maneuvers. Using those, the spin axis is placed normal to the orbit plane (nominally), allowing full pitch-angle resolution twice per spin. An energetic particle detector for ions (EPDI) measures 250 keV - 5 MeV ions, addressing secondary science. Funded initially by CalSpace and the University Nanosat Program, ELFIN was selected for flight with joint support from NSF and NASA between 2014 and 2018 and launched by the ELaNa XVIII program on a Delta II rocket (with IceSatII as the primary). Mission operations are currently funded by NASA. Working under experienced UCLA mentors, with advice from The Aerospace Corporation and NASA personnel, more than 250 undergraduates have matured the ELFIN implementation strategy; developed the instruments, satellite, and ground systems and operate the two satellites. ELFIN's already high potential for cutting-edge science return is compounded by concurrent equatorial Heliophysics missions (THEMIS, Arase, Van Allen Probes, MMS) and ground stations. ELFIN's integrated data analysis approach, rapid dissemination strategies via the SPace Environment Data Analysis System (SPEDAS), and data coordination with the Heliophysics/Geospace System Observatory (H/GSO) optimize science yield, enabling the widest community benefits. Several storm-time events have already been captured and are presented herein to demonstrate ELFIN's data analysis methods and potential. These form the basis of on-going studies to resolve the primary mission science objective. Broad energy precipitation events, precipitation bands, and microbursts, clearly seen both at dawn and dusk, extend from tens of keV to >1 MeV. This broad energy range of precipitation indicates that multiple waves are providing scattering concurrently. Many observed events show significant backscattered fluxes, which in the past were hard to resolve by equatorial spacecraft or non-pitch-angle-resolving ionospheric missions. These observations suggest that the ionosphere plays a significant role in modifying magnetospheric electron fluxes and wave-particle interactions. Routine data captures starting in February 2020 and lasting for at least another year, approximately the remainder of the mission lifetime, are expected to provide a very rich dataset to address questions even beyond the primary mission science objective.
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Affiliation(s)
- V Angelopoulos
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - E Tsai
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - L Bingley
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - C Shaffer
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
| | - D L Turner
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
| | - A Runov
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - W Li
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Department of Astronomy and Center for Space Physics, Boston University, Boston, MA 02215 USA
| | - J Liu
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - A V Artemyev
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - X-J Zhang
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - R J Strangeway
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - R E Wirz
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - Y Y Shprits
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- GFZ German Research Centre for Geosciences, Potsdam, 14473 Germany
| | - V A Sergeev
- Saint Petersburg State University, St. Petersburg, 199034 Russia
| | - R P Caron
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - M Chung
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
| | - P Cruce
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - W Greer
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - E Grimes
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - K Hector
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Raytheon Space and Airborne Systems, El Segundo, CA 90245 USA
| | - M J Lawson
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - D Leneman
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - E V Masongsong
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - C L Russell
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - C Wilkins
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - D Hinkley
- The Aerospace Corporation, El Segundo, CA 90245 USA
| | - J B Blake
- The Aerospace Corporation, El Segundo, CA 90245 USA
| | - N Adair
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Millenium Space Systems, El Segundo, CA 90245 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - M Allen
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - M Anderson
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Aptiv, Agoura Hills, CA 91301 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - M Arreola-Zamora
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - J Artinger
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
| | - J Asher
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723 USA
| | - D Branchevsky
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- The Aerospace Corporation, El Segundo, CA 90245 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - M R Capitelli
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Millenium Space Systems, El Segundo, CA 90245 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - R Castro
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Raytheon Space and Airborne Systems, El Segundo, CA 90245 USA
| | - G Chao
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: The Boeing Company, Long Beach, CA 90808 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - N Chung
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: SF Motors, Santa Clara, CA 95054 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - M Cliffe
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: SpaceX, Hawthorne, CA 90250 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - K Colton
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Planet Labs, Inc., San Francisco, CA 94107 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - C Costello
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - D Depe
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - B W Domae
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - S Eldin
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - L Fitzgibbon
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
| | - A Flemming
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - I Fox
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - D M Frederick
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Millenium Space Systems, El Segundo, CA 90245 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - A Gilbert
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - A Gildemeister
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - A Gonzalez
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: SpaceX, Hawthorne, CA 90250 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - B Hesford
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Jet Propulsion Laboratory, Pasadena, CA 91109 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - S Jha
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - N Kang
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Millenium Space Systems, El Segundo, CA 90245 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - J King
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - R Krieger
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Mercedes-Benz Research and Development North America, Long Beach, CA 90810 USA
| | - K Lian
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - J Mao
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Verona, WI 53593 USA
| | - E McKinney
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: California State Polytechnic University, Pomona, CA 91768 USA
| | - J P Miller
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - A Norris
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
| | - M Nuesca
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - A Palla
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - E S Y Park
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Economics Department, University of California, Los Angeles, CA 90095 USA
| | - C E Pedersen
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - Z Qu
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - R Rozario
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: SpaceX, Hawthorne, CA 90250 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - E Rye
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - R Seaton
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - A Subramanian
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Northrop Grumman Aerospace Systems, Redondo Beach, CA 90278 USA
| | - S R Sundin
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Tyvak Nano-Satellite Systems, Inc., Irvine, CA 92618 USA
| | - A Tan
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Experior Laboratories, Oxnard, CA 93033 USA
| | - W Turner
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
| | - A J Villegas
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
| | - M Wasden
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - G Wing
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Computer Science Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - C Wong
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Physics and Astronomy Department, University of California, Los Angeles, CA 90095 USA
| | - E Xie
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Electrical and Computer Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - S Yamamoto
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering, University of California, Los Angeles, CA 90095 USA
| | - R Yap
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Mathematics Department, University of California, Los Angeles, CA 90095 USA
| | - A Zarifian
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Present Address: Jet Propulsion Laboratory, Pasadena, CA 91109 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
| | - G Y Zhang
- Earth, Planetary, and Space Sciences Department, University of California, Los Angeles, CA 90095 USA
- Institute of Geophysics and Planetary Physics, University of California, San Diego, CA USA
- Present Address: Qualcomm, San Diego, CA 92121 USA
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Vonsky M, Shabaeva M, Runov A, Lebedeva N, Chowdhury S, Palefsky JM, Isaguliants M. Carcinogenesis Associated with Human Papillomavirus Infection. Mechanisms and Potential for Immunotherapy. Biochemistry (Mosc) 2019; 84:782-799. [PMID: 31509729 DOI: 10.1134/s0006297919070095] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Human papillomavirus (HPV) infection is responsible for approximately 5% of all cancers and is associated with 30% of all pathogen-related cancers. Cervical cancer is the third most common cancer in women worldwide; about 70% of cervical cancer cases are caused by the high-risk HPVs (HR HPVs) of genotypes 16 and 18. HPV infection occurs mainly through sexual contact; however, viral transmission via horizontal and vertical pathways is also possible. After HPV infection of basal keratinocytes or ecto-endocervical transition zone cells, viral DNA persists in the episomal form. In most cases, infected cells are eliminated by the immune system. Occasionally, elimination fails, and HPV infection becomes chronic. Replication of HPVs in dividing epithelial cells is accompanied by increased expression of the E6 and E7 oncoproteins. These oncoproteins are responsible for genomic instability, disruption of the cell cycle, cell proliferation, immortalization, and malignant transformation of HPV-infected cells. Besides, E6 and E7 oncoproteins induce immunosuppression, preventing the detection of HPV-infected and transformed cells by the immune system. HPV integration into the genome of the host cell leads to the upregulation of E6 and E7 expression and contributes to HPV-associated malignization. Prophylactic HPV vaccines can prevent over 80% of HPV-associated anogenital cancers. The vaccine elicits immune response that prevents initial infection with a given HPV type but does not eliminate persistent virus once infection has occurred and does not prevent development of the HPV-associated neoplasias, which necessitates the development of therapeutic vaccines to treat chronic HPV infections and HPV-associated malignancies.
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Affiliation(s)
- M Vonsky
- Institute of Cytology, Russian Academy of Sciences, St. Petersburg, 194064, Russia. .,Almazov National Medical Research Center, St. Petersburg, 197341, Russia
| | - M Shabaeva
- Pavlov First St. Petersburg State Medical University, St. Petersburg, 197022, Russia.
| | - A Runov
- Institute of Cytology, Russian Academy of Sciences, St. Petersburg, 194064, Russia.,Almazov National Medical Research Center, St. Petersburg, 197341, Russia.,Gamaleya Federal Research Center for Epidemiology and Microbiology, Moscow, 123098, Russia
| | - N Lebedeva
- Gamaleya Federal Research Center for Epidemiology and Microbiology, Moscow, 123098, Russia. .,Moscow Regional Center of AIDS and Infectious Diseases Prevention and Treatment, Moscow, 129110, Russia
| | - S Chowdhury
- University of California, San Francisco School of Medicine, San Francisco, CA 94143, USA
| | - J M Palefsky
- University of California, San Francisco School of Medicine, San Francisco, CA 94143, USA.
| | - M Isaguliants
- Gamaleya Federal Research Center for Epidemiology and Microbiology, Moscow, 123098, Russia. .,Chumakov Federal Scientific Center for Research and Development of Immune-and-Biological Products, Russian Academy of Sciences, Moscow, 108819, Russia.,Karolinska Institutet, Department of Microbiology, Tumor and Cell Biology, Stockholm, SE-171 77, Sweden.,Riga Stradins University, Department of Pathology, Riga, LV-1007, Latvia
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4
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Haaland S, Runov A, Artemyev A, Angelopoulos V. Characteristics of the Flank Magnetopause: THEMIS Observations. J Geophys Res Space Phys 2019; 124:3421-3435. [PMID: 31423410 PMCID: PMC6686701 DOI: 10.1029/2019ja026459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 04/01/2019] [Accepted: 04/30/2019] [Indexed: 06/10/2023]
Abstract
The terrestrial magnetopause is the boundary that shields the Earth's magnetosphere on one side from the shocked solar wind and its embedded interplanetary magnetic field on the other side. In this paper, we show observations from two of the Time History of Events and Macroscales Interactions during Substorms (THEMIS) satellites, comparing dayside magnetopause crossings with flank crossings near the terminator. Macroscopic properties such as current sheet thickness, motion, and current density are examined for a large number of magnetopause crossings. The results show that the flank magnetopause is typically thicker than the dayside magnetopause and has a lower current density. Consistent with earlier results from Cluster observations, we also find a persistent dawn-dusk asymmetry with a thicker and more dynamic magnetopause at dawn than at dusk.
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Affiliation(s)
- S. Haaland
- Birkeland Centre for Space ScienceUniversity of BergenBergenNorway
- Max‐Planck Institute for Solar Systems ResearchGöttingenGermany
| | - A. Runov
- Department of Space PhysicsUniversity of CaliforniaLos AngelesCAUSA
| | - A. Artemyev
- Department of Space PhysicsUniversity of CaliforniaLos AngelesCAUSA
- Space Research InstituteRussian Academy of ScienceMoscowRussia
| | - V. Angelopoulos
- Department of Space PhysicsUniversity of CaliforniaLos AngelesCAUSA
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5
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Kiehas SA, Runov A, Angelopolos V, Hietala H, Korovinksiy D. Magnetotail Fast Flow Occurrence Rate and Dawn-Dusk Asymmetry at X GSM ∼ -60 R E. J Geophys Res Space Phys 2018; 123:1767-1778. [PMID: 29780679 PMCID: PMC5947117 DOI: 10.1002/2017ja024776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/28/2017] [Accepted: 01/11/2018] [Indexed: 06/02/2023]
Abstract
As a direct result of magnetic reconnection, plasma sheet fast flows act as primary transporter of mass, flux, and energy in the Earth's magnetotail. During the last decades, these flows were mainly studied within XGSM>-60RE , as observations near or beyond lunar orbit were limited. By using 5 years (2011-2015) of ARTEMIS (Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moons Interaction with the Sun) data, we statistically investigate earthward and tailward flows at around 60 RE downtail. A significant fraction of fast flows is directed earthward, comprising 43% (vx >400 km/s) to 56% (vx >100 km/s) of all observed flows. This suggests that near-Earth and midtail reconnection are equally probable of occurring on either side of the ARTEMIS downtail distance. For fast convective flows (v⊥x >400 km/s), this fraction of earthward flows is reduced to about 29%, which is in line with reconnection as source of these flows and a downtail decreasing Alfvén velocity. More than 60% of tailward convective flows occur in the dusk sector (as opposed to the dawn sector), while earthward convective flows are nearly symmetrically distributed between the two sectors for low AL (>-400 nT) and asymmetrically distributed toward the dusk sector for high AL (<-400 nT). This indicates that the dawn-dusk asymmetry is more pronounced closer to Earth and moves farther downtail during high geomagnetic activity. This is consistent with similar observations pointing to the asymmetric nature of tail reconnection as the origin of the dawn-dusk asymmetry of flows and other related observables. We infer that near-Earth reconnection is preferentially located at dusk, whereas midtail reconnection (X >- 60RE ) is likely symmetric across the tail during weak substorms and asymmetric toward the dusk sector for strong substorms, as the dawn-dusk asymmetric nature of reconnection onset in the near-Earth region progresses downtail.
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Affiliation(s)
- S. A. Kiehas
- Space Research InstituteAustrian Academy of SciencesGrazAustria
| | - A. Runov
- Institute of Geophysics and Planetary Physics, Department of Earth, Planetary, and Space SciencesUniversity of CaliforniaLos AngelesCAUSA
| | - V. Angelopolos
- Institute of Geophysics and Planetary Physics, Department of Earth, Planetary, and Space SciencesUniversity of CaliforniaLos AngelesCAUSA
| | - H. Hietala
- Institute of Geophysics and Planetary Physics, Department of Earth, Planetary, and Space SciencesUniversity of CaliforniaLos AngelesCAUSA
| | - D. Korovinksiy
- Space Research InstituteAustrian Academy of SciencesGrazAustria
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6
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Angelopoulos V, Runov A, Zhou XZ, Turner DL, Kiehas SA, Li SS, Shinohara I. Electromagnetic Energy Conversion at Reconnection Fronts. Science 2013; 341:1478-82. [DOI: 10.1126/science.1236992] [Citation(s) in RCA: 204] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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7
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Ge YS, Zhou XZ, Liang J, Raeder J, Gilson ML, Donovan E, Angelopoulos V, Runov A. Dipolarization fronts and associated auroral activities: 1. Conjugate observations and perspectives from global MHD simulations. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012ja017676] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Kubyshkina M, Sergeev V, Tsyganenko N, Angelopoulos V, Runov A, Donovan E, Singer H, Auster U, Baumjohann W. Time-dependent magnetospheric configuration and breakup mapping during a substorm. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja015882] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. Kubyshkina
- Institute of Physics; Saint Petersburg State University; St. Petersburg Russia
| | - V. Sergeev
- Institute of Physics; Saint Petersburg State University; St. Petersburg Russia
| | - N. Tsyganenko
- Institute of Physics; Saint Petersburg State University; St. Petersburg Russia
| | - V. Angelopoulos
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - A. Runov
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - E. Donovan
- Department of Physics and Astronomy; University of Calgary; Calgary, Alberta Canada
| | - H. Singer
- NOAA Space Weather Prediction Center; Boulder Colorado USA
| | - U. Auster
- Institut für Geophysik und Extraterrestrische Physik der Technischen Universitaet Braunschweig; Braunschweig Germany
| | - W. Baumjohann
- Space Research Institute; Austrian Academy of Sciences; Graz Austria
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Kubyshkina M, Sergeev V, Tsyganenko N, Angelopoulos V, Runov A, Singer H, Glassmeier KH, Auster HU, Baumjohann W. Toward adapted time-dependent magnetospheric models: A simple approach based on tuning the standard model. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008ja013547] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- M. Kubyshkina
- Institute of Physics; Saint Petersburg State University; Saint Petersburg Russia
| | - V. Sergeev
- Institute of Physics; Saint Petersburg State University; Saint Petersburg Russia
| | - N. Tsyganenko
- Institute of Physics; Saint Petersburg State University; Saint Petersburg Russia
| | - V. Angelopoulos
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - A. Runov
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - H. Singer
- Space Weather Prediction Center; NOAA; Boulder Colorado USA
| | - K. H. Glassmeier
- Institut für Geophysik und Extraterrestrische Physik; Technischen Universität Braunschweig; Braunschweig Germany
| | - H. U. Auster
- Institut für Geophysik und Extraterrestrische Physik; Technischen Universität Braunschweig; Braunschweig Germany
| | - W. Baumjohann
- Space Research Institute; Austrian Academy of Sciences; Graz Austria
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