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MMS Multipoint electric field observations of small‐scale magnetic holes
Author(s) -
Goodrich Katherine A.,
Ergun Robert E.,
Wilder Frederick D.,
Burch James,
Torbert Roy,
Khotyaintsev Yuri,
Lindqvist PerArne,
Russell Christopher,
Strangeway Robert,
Magnes Werner,
Gershman Daniel,
Giles Barbara,
Nakamura Rumi,
Stawarz Julia,
Holmes Justin,
Sturner Andrew,
Malaspina David M.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl069157
Subject(s) - gyroradius , physics , electric field , magnetosphere , magnetic field , electron , computational physics , geophysics , radius , ion , electric current , quantum mechanics , computer security , computer science
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 ( ρ i ). 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.