TY - JOUR
T1 - MMS Multipoint electric field observations of small-scale magnetic holes
AU - Goodrich, Katherine A.
AU - Ergun, Robert E.
AU - Wilder, Frederick D.
AU - Burch, James
AU - Torbert, Roy
AU - Khotyaintsev, Yuri
AU - Lindqvist, Per-Arne
AU - Russell, Christopher
AU - Strangeway, Robert
AU - Magnes, Werner
AU - Gershman, Daniel
AU - Giles, Barbara
AU - Nakamura, Rumi
AU - Stawarz, Julia
AU - Holmes, Justin
AU - Sturner, Andrew
AU - Malaspina, David M.
PY - 2016/6/28
Y1 - 2016/6/28
N2 - 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.
AB - 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.
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000380910100006&KeyUID=WOS:000380910100006
U2 - 10.1002/2016GL069157
DO - 10.1002/2016GL069157
M3 - Article
SN - 0094-8276
VL - 43
SP - 5953
EP - 5959
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 12
ER -