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Lower Hybrid Waves at the Magnetosheath Separatrix Region
Author(s) -
Tang B.B.,
Li W. Y.,
Graham D. B.,
Wang C.,
Khotyaintsev Yu. V.,
Le A.,
Giles B. L.,
Lindqvist P.A.,
Ergun R. E.,
Burch J. L.
Publication year - 2020
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 - 10.1029/2020gl089880
Subject(s) - magnetosheath , physics , lower hybrid oscillation , magnetopause , geophysics , field line , magnetic reconnection , instability , magnetosphere , bow wave , computational physics , magnetic field , wave propagation , solar wind , mechanics , optics , electromagnetic electron wave , quantum mechanics
Lower hybrid waves are investigated at the magnetosheath separatrix region in asymmetric guide field reconnection by using the Magnetospheric Multiscale (MMS) mission. Three of the four MMS spacecraft observe clear wave activities around the lower hybrid frequency across the magnetosheath separatrix, where a density gradient is present. The observed waves are consistent with generation by the lower hybrid drift instability. The characteristic properties of these waves include the following: (1) the waves propagate toward the x‐line in the spacecraft frame due to the large out‐of‐plane magnetic field, which is in the same direction of the diamagnetic drift of the x‐line; (2) the wave potential is about 20% of the electron temperature. These drift waves effectively produce cross‐field particle diffusion, enabling the transport of magnetosheath electrons into the exhaust region. At last, we suggest that the lower hybrid waves at the magnetosheath separatrix region represent some unique features of asymmetric guide field reconnection, which is different from that widely observed at the magnetospheric side of magnetopause reconnection.