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Electron dropout echoes induced by interplanetary shock: Van Allen Probes observations
Author(s) -
Hao Y. X.,
Zong Q.G.,
Zhou X.Z.,
Fu S. Y.,
Rankin R.,
Yuan C.J.,
Lui A. T. Y.,
Spence H. E.,
Blake J. B.,
Baker D. N.,
Reeves G. D.
Publication year - 2016
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 - 10.1002/2016gl069140
Subject(s) - physics , interplanetary spaceflight , dropout (neural networks) , substorm , electron , magnetopause , magnetosphere , astrophysics , computational physics , solar wind , atomic physics , plasma , nuclear physics , machine learning , computer science
On 23 November 2012, a sudden dropout of the relativistic electron flux was observed after an interplanetary shock arrival. The dropout peaks at ∼1 MeV 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.