Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations

TitleElectron dropout echoes induced by interplanetary shock: Van Allen Probes observations
Publication TypeJournal Article
Year of Publication2016
AuthorsHao, YX, Zong, Q-G, Zhou, X-Z, Fu, SY, Rankin, R, Yuan, C-J, Lui, ATY, Spence, HE, Blake, JB, Baker, DN, Reeves, GD
JournalGeophysical Research Letters
Date Published05/2016
KeywordsDrift shell splitting; electron dropout echo; energetic particle; interplanetary shock; magnetopause shadowing; solar wind-magnetospheric coupling; Van Allen Probes
AbstractOn 23 November 2012, a sudden dropout of the relativistic electron flux was observed after an interplanetary shock arrival. The dropout peaks at ∼1MeV and more than 80% of the electrons disappeared from the drift shell. Van Allen twin Probes observed a sharp electron flux dropout with clear energy dispersion signals. The repeating flux dropout and recovery signatures, or “dropout echoes”, constitute a new phenomenon referred to as a “drifting electron dropout” with a limited initial spatial range. The azimuthal range of the dropout is estimated to be on the duskside, from ∼1300 to 0100 LT. We conclude that the shock-induced electron dropout is not caused by the magnetopause shadowing. The dropout and consequent echoes suggest that the radial migration of relativistic electrons is induced by the strong dusk-dawn asymmetric interplanetary shock compression on the magnetosphere
Short TitleGeophys. Res. Lett.

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