skip to main content


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

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 then conclude that the shock-induced electron dropout is not caused by the magnetopause shadowing. Furthermore, 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.
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ; ORCiD logo [8]
  1. Peking Univ., Beijing (China). Inst. of Space Physics and Applied Technology
  2. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Geology and Geophysics
  4. Johns Hopkins Univ., Baltimore, MD (United States). Applied Physics Lab.
  5. Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics Inst. for Earth Oceans and Space
  6. Aerospace Corporation, Los Angeles, CA (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Space and Atmospheric Sciences Group
  8. Univ. of Colorado, Boulder, CO (United States). Lab for Atmospheric and Space Physics
Publication Date:
Report Number(s):
Journal ID: ISSN 0094-8276; TRN: US1702873
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 11; Journal ID: ISSN 0094-8276
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics
OSTI Identifier: