Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53a1356g&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53A-1356
Physics
Plasma Physics
[2764] Magnetospheric Physics / Plasma Sheet, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [2790] Magnetospheric Physics / Substorms, [7836] Space Plasma Physics / Mhd Waves And Instabilities
Scientific paper
An examination of the magnetic field near the apogee of the inner THEMIS spacecraft (THD, P3), when the spacecraft was close to the equatorial plane at ~10 RE and near local midnight, reveals the occurrence of mirror mode-like structures. These structures have the same characteristic waveform seen at comets, in the magnetosheath, and in the wake of Io. The examination of mirror mode instability shows that during these structures the threshold of mirror instability is marginally reached. The observed mirror structures occur in the dipolarized magnetic field following a substorm-related dipolarization. These structures significantly weaken the field so it approaches 0.2 nT or less from its background strength of about 10 nT. The pitch angle distribution during these structures is consistent with mirror structure. Similar structures are also found during another orbit of THEMIS C spacecraft in the further tailward region, which also occur after a tail dipolarization event.
Ge Yufei
Larson Davin E.
Raeder Joachim
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