globalchange  > 气候减缓与适应
DOI: 10.1029/2018JA025529
Scopus记录号: 2-s2.0-85052645647
论文题名:
The Role of the Parallel Electric Field in Electron-Scale Dissipation at Reconnecting Currents in the Magnetosheath
作者: Wilder F.D.; Ergun R.E.; Burch J.L.; Ahmadi N.; Eriksson S.; Phan T.D.; Goodrich K.A.; Shuster J.; Rager A.C.; Torbert R.B.; Giles B.L.; Strangeway R.J.; Plaschke F.; Magnes W.; Lindqvist P.A.; Khotyaintsev Y.V.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:8
起始页码: 6533
结束页码: 6547
语种: 英语
英文关键词: current sheets ; diffusion region ; electric fields ; magnetosheath ; reconnection
英文摘要: We report observations from the Magnetospheric Multiscale satellites of reconnecting current sheets in the magnetosheath over a range of out-of-plane “guide” magnetic field strengths. The currents exhibit nonideal energy conversion in the electron frame of reference, and the events are within the ion diffusion region within close proximity (a few electron skin depths) to the electron diffusion region. The study focuses on energy conversion on the electron scale only. At low guide field (antiparallel reconnection), electric fields and currents perpendicular to the magnetic field dominate the energy conversion. Additionally, electron distributions exhibit significant nongyrotropy. As the guide field increases, the electric field parallel to the background magnetic field becomes increasingly strong, and the electron nongyrotropy becomes less apparent. We find that even with a guide field less than half the reconnecting field, the parallel electric field and currents dominate the dissipation. This suggests that parallel electric fields are more important to energy conversion in reconnection than previously thought and that at high guide field, the physics governing magnetic reconnection are significantly different from antiparallel reconnection. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113435
Appears in Collections:气候减缓与适应

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作者单位: Laboratory of Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; Department of Astrophysical and Planetary Sciences, University of Colorado Boulder, Boulder, CO, United States; Southwest Research Institute, San Antonio, TX, United States; Space Sciences Laboratory, University of California, Berkeley, CA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; University of Maryland, College Park, MD, United States; Department of Physics, Catholic University of America, Washington, DC, United States; 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; Space Research Institute, Austrian Academy of Sciences, Graz, Austria; Royal Institute of Technology, Stockholm, Sweden; Swedish Institute of Space Physics, Uppsala, Sweden

Recommended Citation:
Wilder F.D.,Ergun R.E.,Burch J.L.,et al. The Role of the Parallel Electric Field in Electron-Scale Dissipation at Reconnecting Currents in the Magnetosheath[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)
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