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Sulaiman AH, Mauk BH, Szalay JR, Allegrini F, Clark G, Gladstone GR, Kotsiaros S, Kurth WS, Bagenal F, Bonfond B, Connerney JEP, Ebert RW, Elliott SS, Gershman DJ, Hospodarsky GB, Hue V, Lysak RL, Masters A, Santolík O, Saur J, Bolton SJ. Jupiter's Low-Altitude Auroral Zones: Fields, Particles, Plasma Waves, and Density Depletions. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2022; 127:e2022JA030334. [PMID: 36247326 PMCID: PMC9539694 DOI: 10.1029/2022ja030334] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 06/15/2022] [Accepted: 07/21/2022] [Indexed: 06/16/2023]
Abstract
The Juno spacecraft's polar orbits have enabled direct sampling of Jupiter's low-altitude auroral field lines. While various data sets have identified unique features over Jupiter's main aurora, they are yet to be analyzed altogether to determine how they can be reconciled and fit into the bigger picture of Jupiter's auroral generation mechanisms. Jupiter's main aurora has been classified into distinct "zones", based on repeatable signatures found in energetic electron and proton spectra. We combine fields, particles, and plasma wave data sets to analyze Zone-I and Zone-II, which are suggested to carry upward and downward field-aligned currents, respectively. We find Zone-I to have well-defined boundaries across all data sets. H+ and/or H3 + cyclotron waves are commonly observed in Zone-I in the presence of energetic upward H+ beams and downward energetic electron beams. Zone-II, on the other hand, does not have a clear poleward boundary with the polar cap, and its signatures are more sporadic. Large-amplitude solitary waves, which are reminiscent of those ubiquitous in Earth's downward current region, are a key feature of Zone-II. Alfvénic fluctuations are most prominent in the diffuse aurora and are repeatedly found to diminish in Zone-I and Zone-II, likely due to dissipation, at higher altitudes, to energize auroral electrons. Finally, we identify significant electron density depletions, by up to 2 orders of magnitude, in Zone-I, and discuss their important implications for the development of parallel potentials, Alfvénic dissipation, and radio wave generation.
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Affiliation(s)
- A. H. Sulaiman
- Department of Physics and AstronomyUniversity of IowaIowa CityIAUSA
| | - B. H. Mauk
- Applied Physics LaboratoryJohns Hopkins UniversityLaurelMDUSA
| | - J. R. Szalay
- Department of Astrophysical SciencesPrinceton UniversityPrincetonNJUSA
| | - F. Allegrini
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | - G. Clark
- Applied Physics LaboratoryJohns Hopkins UniversityLaurelMDUSA
| | - G. R. Gladstone
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | - S. Kotsiaros
- DTU‐SpaceTechnical University of DenmarkKongens LyngbyDenmark
| | - W. S. Kurth
- Department of Physics and AstronomyUniversity of IowaIowa CityIAUSA
| | - F. Bagenal
- Laboratory for Atmospheric and Space PhysicsUniversity of Colorado BoulderBoulderCOUSA
| | - B. Bonfond
- Space SciencesTechnologies and Astrophysics Research InstituteLPAPUniversité de LiègeLiègeBelgium
| | - J. E. P. Connerney
- Space Research CorporationAnnapolisMDUSA
- NASA/Goddard Space Flight CenterGreenbeltMDUSA
| | - R. W. Ebert
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | - S. S. Elliott
- Minnetota Institute for AstrophysicsSchool of Physics and AstronomyUniversity of MinnesotaMinneapolisMNUSA
| | | | | | - V. Hue
- Southwest Research InstituteSan AntonioTXUSA
| | - R. L. Lysak
- Minnetota Institute for AstrophysicsSchool of Physics and AstronomyUniversity of MinnesotaMinneapolisMNUSA
| | - A. Masters
- Blackett LaboratoryImperial College LondonLondonUK
| | - O. Santolík
- Department of Space PhysicsInstitute of Atmospheric Physics of the Czech Academy of SciencesPragueCzechia
- Faculty of Mathematics and PhysicsCharles UniversityPragueCzechia
| | - J. Saur
- Institute of Geophysics and MeteorologyUniversity of CologneCologneGermany
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Szalay JR, Clark G, Livadiotis G, McComas DJ, Mitchell DG, Rankin JS, Sulaiman AH, Allegrini F, Bagenal F, Ebert RW, Gladstone GR, Kurth WS, Mauk BH, Valek PW, Wilson RJ, Bolton SJ. Closed Fluxtubes and Dispersive Proton Conics at Jupiter's Polar Cap. GEOPHYSICAL RESEARCH LETTERS 2022; 49:e2022GL098741. [PMID: 35859815 PMCID: PMC9285739 DOI: 10.1029/2022gl098741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 04/14/2022] [Accepted: 04/16/2022] [Indexed: 05/08/2023]
Abstract
Two distinct proton populations are observed over Jupiter's southern polar cap: a ∼1 keV core population and ∼1-300 keV dispersive conic population at 6-7 RJ planetocentric distance. We find the 1 keV core protons are likely the seed population for the higher-energy dispersive conics, which are accelerated from a distance of ∼3-5 RJ. Transient wave-particle heating in a "pressure-cooker" process is likely responsible for this proton acceleration. The plasma characteristics and composition during this period show Jupiter's polar-most field lines can be topologically closed, with conjugate magnetic footpoints connected to both hemispheres. Finally, these observations demonstrate energetic protons can be accelerated into Jupiter's magnetotail via wave-particle coupling.
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Affiliation(s)
- J. R. Szalay
- Department of Astrophysical SciencesPrinceton UniversityPrincetonNJUSA
| | - G. Clark
- The Johns Hopkins University Applied Physics LaboratoryLaurelMDUSA
| | - G. Livadiotis
- Department of Astrophysical SciencesPrinceton UniversityPrincetonNJUSA
| | - D. J. McComas
- Department of Astrophysical SciencesPrinceton UniversityPrincetonNJUSA
| | - D. G. Mitchell
- The Johns Hopkins University Applied Physics LaboratoryLaurelMDUSA
| | - J. S. Rankin
- Department of Astrophysical SciencesPrinceton UniversityPrincetonNJUSA
| | | | - F. Allegrini
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | - F. Bagenal
- Laboratory for Atmospheric and Space PhysicsUniversity of Colorado BoulderBoulderCOUSA
| | - R. W. Ebert
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | | | | | - B. H. Mauk
- The Johns Hopkins University Applied Physics LaboratoryLaurelMDUSA
| | - P. W. Valek
- Southwest Research InstituteSan AntonioTXUSA
| | - R. J. Wilson
- Laboratory for Atmospheric and Space PhysicsUniversity of Colorado BoulderBoulderCOUSA
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Clark G, Cohen I, Westlake JH, Andrews GB, Brandt P, Gold RE, Gkioulidou MA, Hacala R, Haggerty D, Hill ME, Ho GC, Jaskulek SE, Kollmann P, Mauk BH, McNutt RL, Mitchell DG, Nelson KS, Paranicas C, Paschalidis N, Schlemm CE. The "Puck" energetic charged particle detector: Design, heritage, and advancements. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2016; 121:7900-7913. [PMID: 27867799 PMCID: PMC5101846 DOI: 10.1002/2016ja022579] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 06/10/2016] [Accepted: 07/27/2016] [Indexed: 06/06/2023]
Abstract
Energetic charged particle detectors characterize a portion of the plasma distribution function that plays critical roles in some physical processes, from carrying the currents in planetary ring currents to weathering the surfaces of planetary objects. For several low-resource missions in the past, the need was recognized for a low-resource but highly capable, mass-species-discriminating energetic particle sensor that could also obtain angular distributions without motors or mechanical articulation. This need led to the development of a compact Energetic Particle Detector (EPD), known as the "Puck" EPD (short for hockey puck), that is capable of determining the flux, angular distribution, and composition of incident ions between an energy range of ~10 keV to several MeV. This sensor makes simultaneous angular measurements of electron fluxes from the tens of keV to about 1 MeV. The same measurements can be extended down to approximately 1 keV/nucleon, with some composition ambiguity. These sensors have a proven flight heritage record that includes missions such as MErcury Surface, Space ENvironment, GEochemistry, and Ranging and New Horizons, with multiple sensors on each of Juno, Van Allen Probes, and Magnetospheric Multiscale. In this review paper we discuss the Puck EPD design, its heritage, unexpected results from these past missions and future advancements. We also discuss high-voltage anomalies that are thought to be associated with the use of curved foils, which is a new foil manufacturing processes utilized on recent Puck EPD designs. Finally, we discuss the important role Puck EPDs can potentially play in upcoming missions.
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Affiliation(s)
- G. Clark
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - I. Cohen
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - J. H. Westlake
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - G. B. Andrews
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - P. Brandt
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - R. E. Gold
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - M. A. Gkioulidou
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - R. Hacala
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - D. Haggerty
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - M. E. Hill
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - G. C. Ho
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - S. E. Jaskulek
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - P. Kollmann
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - B. H. Mauk
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - R. L. McNutt
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - D. G. Mitchell
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - K. S. Nelson
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - C. Paranicas
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | | | - C. E. Schlemm
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
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Jackman CM, Thomsen MF, Mitchell DG, Sergis N, Arridge CS, Felici M, Badman SV, Paranicas C, Jia X, Hospodarksy GB, Andriopoulou M, Khurana KK, Smith AW, Dougherty MK. Field dipolarization in Saturn's magnetotail with planetward ion flows and energetic particle flow bursts: Evidence of quasi-steady reconnection. JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS 2015; 120:3603-3617. [PMID: 27570722 PMCID: PMC4981121 DOI: 10.1002/2015ja020995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 04/01/2015] [Accepted: 04/01/2015] [Indexed: 05/20/2023]
Abstract
We present a case study of an event from 20 August (day 232) of 2006, when the Cassini spacecraft was sampling the region near 32 RS and 22 h LT in Saturn's magnetotail. Cassini observed a strong northward-to-southward turning of the magnetic field, which is interpreted as the signature of dipolarization of the field as seen by the spacecraft planetward of the reconnection X line. This event was accompanied by very rapid (up to ~1500 km s-1) thermal plasma flow toward the planet. At energies above 28 keV, energetic hydrogen and oxygen ion flow bursts were observed to stream planetward from a reconnection site downtail of the spacecraft. Meanwhile, a strong field-aligned beam of energetic hydrogen was also observed to stream tailward, likely from an ionospheric source. Saturn kilometric radiation emissions were stimulated shortly after the observation of the dipolarization. We discuss the field, plasma, energetic particle, and radio observations in the context of the impact this reconnection event had on global magnetospheric dynamics.
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Affiliation(s)
- C. M. Jackman
- School of Physics and AstronomyUniversity of SouthamptonSouthamptonUK
| | | | - D. G. Mitchell
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | | | | | - M. Felici
- Department of PhysicsLancaster UniversityBailriggUK
- Mullard Space Science LaboratoryUniversity College LondonSurreyUK
- The Centre for Planetary Sciences at UCL/BirkbeckLondonUK
| | - S. V. Badman
- Department of PhysicsLancaster UniversityBailriggUK
| | - C. Paranicas
- The Johns Hopkins University Applied Physics LaboratoryLaurelMarylandUSA
| | - X. Jia
- Atmospheric, Oceanic and Space SciencesUniversity of MichiganAnn ArborMichiganUSA
| | - G. B. Hospodarksy
- Department of Physics and AstronomyUniversity of IowaIowa CityIowaUSA
| | - M. Andriopoulou
- Space Research InstituteAustrian Academy of SciencesGrazAustria
| | - K. K. Khurana
- Institute of Geophysics and Planetary PhysicsUniversity of CaliforniaLos AngelesCaliforniaUSA
| | - A. W. Smith
- School of Physics and AstronomyUniversity of SouthamptonSouthamptonUK
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5
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Mauk B, Bagenal F. Comparative Auroral Physics: Earth and Other Planets. GEOPHYSICAL MONOGRAPH SERIES 2013. [DOI: 10.1029/2011gm001192] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Schippers P, André N, Gurnett DA, Lewis GR, Persoon AM, Coates AJ. Identification of electron field-aligned current systems in Saturn's magnetosphere. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011ja017352] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Badman SV, Achilleos N, Arridge CS, Baines KH, Brown RH, Bunce EJ, Coates AJ, Cowley SWH, Dougherty MK, Fujimoto M, Hospodarsky G, Kasahara S, Kimura T, Melin H, Mitchell DG, Stallard T, Tao C. Cassini observations of ion and electron beams at Saturn and their relationship to infrared auroral arcs. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011ja017222] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Schippers P, Arridge CS, Menietti JD, Gurnett DA, Lamy L, Cecconi B, Mitchell DG, André N, Kurth WS, Grimald S, Dougherty MK, Coates AJ, Krupp N, Young DT. Auroral electron distributions within and close to the Saturn kilometric radiation source region. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011ja016461] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- P. Schippers
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - C. S. Arridge
- Mullard Space Science Laboratory; University College London; Holmbury St. Mary UK
- Centre for Planetary Sciences at UCL/Birkbeck; London WC1E 6BT UK
| | - J. D. Menietti
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - D. A. Gurnett
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - L. Lamy
- Department of Space and Atmospheric Physics; Imperial College; London UK
- LESIA, CNRS; Observatoire de Meudon; Meudon France
| | - B. Cecconi
- LESIA, CNRS; Observatoire de Meudon; Meudon France
| | - D. G. Mitchell
- Applied Physics Laboratory; Johns Hopkins University; Laurel Maryland USA
| | - N. André
- Centre d'Étude Spatiale des Rayonnements; Université de Toulouse, UPS; Toulouse France
- CNRS UMR 5187; Toulouse France
| | - W. S. Kurth
- Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
| | - S. Grimald
- Centre d'Étude Spatiale des Rayonnements; Université de Toulouse, UPS; Toulouse France
- CNRS UMR 5187; Toulouse France
| | - M. K. Dougherty
- Department of Space and Atmospheric Physics; Imperial College; London UK
| | - A. J. Coates
- Mullard Space Science Laboratory; University College London; Holmbury St. Mary UK
- Centre for Planetary Sciences at UCL/Birkbeck; London WC1E 6BT UK
| | - N. Krupp
- Max-Planck-Institut fur Sonnensystemforschung; Katlenburg-Lindau Germany
| | - D. T. Young
- Southwest Research Institute; San Antonio Texas USA
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Carbary JF, Mitchell DG, Paranicas C, Roelof EC, Krimigis SM, Krupp N, Khurana K, Dougherty M. Pitch angle distributions of energetic electrons at Saturn. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010ja015987] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- J. F. Carbary
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - D. G. Mitchell
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - C. Paranicas
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - E. C. Roelof
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - S. M. Krimigis
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - N. Krupp
- Max Planck Institut für Sonnensystemforschung; Katlenburg-Lindau Germany
| | - K. Khurana
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - M. Dougherty
- Space and Atmospheric Physics Group; Imperial College; London UK
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Masters A, Achilleos N, Kivelson MG, Sergis N, Dougherty MK, Thomsen MF, Arridge CS, Krimigis SM, McAndrews HJ, Kanani SJ, Krupp N, Coates AJ. Cassini observations of a Kelvin-Helmholtz vortex in Saturn's outer magnetosphere. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010ja015351] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- A. Masters
- Space and Atmospheric Physics Group, Blackett Laboratory; Imperial College London; London UK
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- Center for Planetary Sciences; University College London; London UK
| | - N. Achilleos
- Center for Planetary Sciences; University College London; London UK
- Atmospheric Physics Laboratory, Department of Physics and Astronomy; University College London; London UK
| | - M. G. Kivelson
- Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
| | - N. Sergis
- Office of Space Research and Technology; Academy of Athens; Athens Greece
| | - M. K. Dougherty
- Space and Atmospheric Physics Group, Blackett Laboratory; Imperial College London; London UK
| | - M. F. Thomsen
- Space Science and Applications; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - C. S. Arridge
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- Center for Planetary Sciences; University College London; London UK
| | - S. M. Krimigis
- Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
| | - H. J. McAndrews
- Space Science and Applications; Los Alamos National Laboratory; Los Alamos New Mexico USA
| | - S. J. Kanani
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- Center for Planetary Sciences; University College London; London UK
| | - N. Krupp
- Max-Planck-Institut für Sonnensystemforschung; Katlenburg-Lindau Germany
| | - A. J. Coates
- Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
- Center for Planetary Sciences; University College London; London UK
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