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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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Mozer FS, Agapitov OA, Artemyev A, Burch JL, Ergun RE, Giles BL, Mourenas D, Torbert RB, Phan TD, Vasko I. Magnetospheric Multiscale Satellite Observations of Parallel Electron Acceleration in Magnetic Field Reconnection by Fermi Reflection from Time Domain Structures. Phys Rev Lett 2016; 116:145101. [PMID: 27104714 DOI: 10.1103/physrevlett.116.145101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Indexed: 06/05/2023]
Abstract
The same time domain structures (TDS) have been observed on two Magnetospheric Multiscale Satellites near Earth's dayside magnetopause. These TDS, traveling away from the X line along the magnetic field at 4000 km/s, accelerated field-aligned ∼5 eV electrons to ∼200 eV by a single Fermi reflection of the electrons by these overtaking barriers. Additionally, the TDS contained both positive and negative potentials, so they were a mixture of electron holes and double layers. They evolve in ∼10 km of space or 7 ms of time and their spatial scale size is 10-20 km, which is much larger than the electron gyroradius (<1 km) or the electron inertial length (4 km at the observation point, less nearer the X line).
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Affiliation(s)
- F S Mozer
- Space Sciences Laboratory, University of California, Berkeley, California 94720, USA
- Taras Shevchenko National University of Kyiv, Glushkova Avenue, 4, Kyiv 01601, Ukraine
- Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90002, USA
- Southwest Research Institute, San Antonio, Texas 78238, USA
- LASP, University of Colorado, Boulder, Colorado 80303, USA
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
- LPC2 E/CNRS-University of Orleans, Orleans 45100, France
- University of New Hampshire, Durham, New Hampshire 03824, USA
- Space Research Institute, Russian Academy of Science, Moscow, Russia 117342
| | - O A Agapitov
- Space Sciences Laboratory, University of California, Berkeley, California 94720, USA
- Taras Shevchenko National University of Kyiv, Glushkova Avenue, 4, Kyiv 01601, Ukraine
| | - A Artemyev
- Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90002, USA
- Space Research Institute, Russian Academy of Science, Moscow, Russia 117342
| | - J L Burch
- Southwest Research Institute, San Antonio, Texas 78238, USA
| | - R E Ergun
- LASP, University of Colorado, Boulder, Colorado 80303, USA
| | - B L Giles
- NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
| | - D Mourenas
- LPC2 E/CNRS-University of Orleans, Orleans 45100, France
| | - R B Torbert
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - T D Phan
- Space Sciences Laboratory, University of California, Berkeley, California 94720, USA
| | - I Vasko
- Space Research Institute, Russian Academy of Science, Moscow, Russia 117342
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Apollonov VV, Artemyev A, Fedorov M, Shapiro E, McIver J. Free-electron laser exploiting a superlattice-like medium. Opt Express 1998; 3:162-170. [PMID: 19384357 DOI: 10.1364/oe.3.000162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Amplification in free-electron lasers exploiting media with periodically modulated refractive indices is studied in the regime of a large modulation. The conditions for realization of the large-modulation regime in a superlattice-like medium are established. The maximized gain, the corresponding saturation field and efficiency, as well as the optimal electron energy and propagation direction are determined. It is shown that the large-modulation regime makes it possible to extend significantly the operation frequency domain of the FEL employing a low-relativistic electron beam. Relationship with the Cherenkov and stimulated resonance-transition-radiation FELs is discussed. This research is partially supported by RFBR grant 97-02-17783.
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Artemyev A, Grobe R, Eberly JH. Hyperspherical-coordinate approach to one-dimensional models of two-electron quantum systems. Phys Rev A 1995; 51:155-162. [PMID: 9911567 DOI: 10.1103/physreva.51.155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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