globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025452
Scopus ID: 2-s2.0-85052432510
Generation of Electron Whistler Waves at the Mirror Mode Magnetic Holes: MMS Observations and PIC Simulation
Author: Ahmadi N.; Wilder F.D.; Ergun R.E.; Argall M.; Usanova M.E.; Breuillard H.; Malaspina D.; Paulson K.; Germaschewski K.; Eriksson S.; Goodrich K.; Torbert R.; Le Contel O.; Strangeway R.J.; Russell C.T.; Burch J.; Giles B.
Source Publication: Journal of Geophysical Research: Space Physics
ISSN: 21699380
Publishing Year: 2018
Volume: 123, Issue:8
pages begin: 6383
pages end: 6393
Language: 英语
Keyword: cross-scale energy transport ; modulation of mirror and whistler instabilities ; PIC simulation
English Abstract: The Magnetospheric Multiscale mission has observed electron whistler waves at the center and at the edges of magnetic holes in the dayside magnetosheath. The magnetic holes are nonlinear mirror structures since their magnitude is anticorrelated with particle density. In this article, we examine the growth mechanisms of these whistler waves and their interaction with the host magnetic hole. In the observations, as magnetic holes develop and get deeper, an electron population gets trapped and develops a temperature anisotropy favorable for whistler waves to be generated. In addition, the decrease in magnetic field magnitude and the increase in density reduce the electron resonance energy, which promotes the electron cyclotron resonance. To investigate this process, we used expanding box particle-in-cell simulations to produce the mirror instability, which then evolve into magnetic holes. The simulation shows that whistler waves can be generated at the center and edges of magnetic holes, which reproduces the primary features of the MMS observations. The simulation shows that the electron temperature anisotropy develops in the center of the magnetic hole once the mirror instability reaches its nonlinear stage of evolution. The plasma is then unstable to whistler waves at the minimum of the magnetic field structures. In the saturation regime of mirror instability, when magnetic holes are developed, the electron temperature anisotropy appears at the edges of the holes and electron distributions become more isotropic at the magnetic field minimum. At the edges, the expansion of magnetic holes decelerates the electrons, which leads to temperature anisotropies. ©2018. American Geophysical Union. All Rights Reserved.
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被引频次[WOS]:10   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候减缓与适应

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Affiliation: Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States; Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO, United States; Space Science Center, University of New Hampshire, Durham, NH, United States; Laboratoire de Physique des Plasmas (LPP), UMR7648, CNRS/Ecole Polytechnique/Sorbonne Université/Univ. Paris Sud/Observatoire de Paris, Paris, France; Department of Physics, University of New Hampshire, Durham, NH, United States; Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA, United States; Southwest Research Institute, San Antonio, TX, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States

Recommended Citation:
Ahmadi N.,Wilder F.D.,Ergun R.E.,et al. Generation of Electron Whistler Waves at the Mirror Mode Magnetic Holes: MMS Observations and PIC Simulation[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)
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