Effect of EMIC Waves on Relativistic and Ultra-Relativistic Electron Populations: Ground-based and Van Allen Probes Observations

Авторы: Usanova M.E., Drozdov A., Orlova K., Mann I.R., Shprits Y., Robertson M.T., Turner D.L., Milling D.K., Kale A., Baker D.N., Thaller S.A., Reeves G.D., Spence H.E., Kletzing C., Wygant J.
Журнал: Geophysical Research Letters
Год издания: 2014
Издательство: American Geophysical Union
Местоположение издательства: United States
DOI: 10.1002/2013GL059024
Аннотация: We study the effect of electromagnetic ion cyclotron (EMIC) waves on the loss and pitch-angle scattering of relativistic and ultra-relativistic electrons during the recovery phase of a moderate geomagnetic storm on October 11, 2012. The EMIC wave activity was observed in-situ on the Van Allen Probes and conjugately on the ground across the CARISMA array throughout an extended 18-hour interval. However, neither enhanced precipitation of >0.7 MeV electrons, nor reductions in Van Allen Probe 90o pitch-angle ultra-relativistic electron flux were observed. Computed radiation belt electron pitch-angle diffusion rates demonstrate that rapid pitch-angle diffusion is confined to low pitch angles and cannot reach 90o. For the first time, from both observational and modeling perspectives, we show evidence of EMIC waves triggering ultra-relativistic (~2-8 MeV) electron loss, but which is confined to pitch angles below around 45 degrees and not affecting the core distribution.
Добавил в систему: Орлова Ксения Геннадьевна

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