globalchange  > 科学计划与规划
DOI: 10.1002/2016GL069157
MMS Multipoint electric field observations of small-scale magnetic holes
Author: Goodrich K.A.; Ergun R.E.; Wilder F.D.; Burch J.; Torbert R.; Khotyaintsev Y.; Lindqvist P.-A.; Russell C.; Strangeway R.; Magnes W.; Gershman D.; Giles B.; Nakamura R.; Stawarz J.; Holmes J.; Sturner A.; Malaspina D.M.
Source Publication: Geophysical Research Letters
ISSN: 0094-9659
EISSN: 1944-9390
Publishing Year: 2016
Volume: 43, Issue:12
pages begin: 5953
pages end: 5959
Language: 英语
Keyword: electron currents ; magnetic holes ; plasma sheet processes
Scopus Keyword: Electric fields ; Magnetic fields ; Magnetism ; Magnetosphere ; Plasma sheaths ; Commissioning phase ; Earth's magnetosphere ; Electron currents ; Field observations ; Magnetic field strengths ; Magnetic holes ; Magnetospheric multi scale ; Plasma sheet ; Magnetoplasma
English Abstract: Small-scale magnetic holes (MHs), local depletions in magnetic field strength, have been observed multiple times in the Earth's magnetosphere in the bursty bulk flow (BBF) braking region. This particular subset of MHs has observed scale sizes perpendicular to the background magnetic field (B) less than the ambient ion Larmor radius (ρi). Previous observations by Time History of Events and Macroscale Interactions during Substorms (THEMIS) indicate that this subset of MHs can be supported by a current driven by the E × B drift of electrons. Ions do not participate in the E × B drift due to the small-scale size of the electric field. While in the BBF braking region, during its commissioning phase, the Magnetospheric Multiscale (MMS) spacecraft observed a small-scale MH. The electric field observations taken during this event suggest the presence of electron currents perpendicular to the magnetic field. These observations also suggest that these currents can evolve to smaller spatial scales. ©2016. American Geophysical Union. All Rights Reserved.
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Document Type: 期刊论文
Appears in Collections:科学计划与规划

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Affiliation: Department of Astrophysical and Planetary Sciences, University of Colorado Boulder, Boulder, CO, United States

Recommended Citation:
Goodrich K.A.,Ergun R.E.,Wilder F.D.,et al. MMS Multipoint electric field observations of small-scale magnetic holes[J]. Geophysical Research Letters,2016-01-01,43(12).
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