Energetic electron injections deep into the inner magnetosphere associated with substorm activity

TitleEnergetic electron injections deep into the inner magnetosphere associated with substorm activity
Publication TypeJournal Article
Year of Publication2015
AuthorsTurner, DL, Claudepierre, SG, Fennell, JF, O'Brien, TP, Blake, JB, Lemon, C, Gkioulidou, M, Takahashi, K, Reeves, GD, Thaller, S, Breneman, A, Wygant, JR, Li, W, Runov, A, Angelopoulos, V
JournalGeophysical Research Letters
Date Published02/2015
Keywordsenergetic particle injections; inner magnetosphere; Radiation belts; substorms; THEMIS; Van Allen Probes
AbstractFrom a survey of the first nightside season of NASA's Van Allen Probes mission (Dec/2012 – Sep/2013), 47 energetic (10s to 100s of keV) electron injection events were found at L-shells ≤ 4, all of which are deeper than any previously reported substorm-related injections. Preliminary details from these events are presented, including how: all occurred shortly after dipolarization signatures and injections were observed at higher L-shells; the deepest observed injection was at L~2.5; and, surprisingly, L≤4 injections are limited in energy to ≤250 keV. We present a detailed case study of one example event revealing that the injection of electrons down to L~3.5 was different from injections observed at higher L and likely resulted from drift resonance with a fast magnetosonic wave in the Pi 2 frequency range inside the plasmasphere. These observations demonstrate that injections occur at very low L-shells and may play an important role for inner zone electrons.
URLhttp://doi.wiley.com/10.1002/2015GL063225
DOI10.1002/2015GL063225
Short TitleGeophys. Res. Lett.


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