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Title: Nonstorm time dropout of radiation belt electron fluxes on 24 September 2013

Radiation belt electron flux dropouts during the main phase of geomagnetic storms have received increasing attention in recent years. Here we focus on a rarely reported nonstorm time dropout event observed by Van Allen Probes on 24 September 2013. Within several hours, the radiation belt electron fluxes exhibited a significant (up to 2 orders of magnitude) depletion over a wide range of radial distances (L > 4.5), energies (~500 keV to several MeV) and equatorial pitch angles (0° ≤ αe ≤ 180°). STEERB simulations show that the relativistic electron loss in the region L = 4.5–6.0 was primarily caused by the pitch angle scattering of observed plasmaspheric hiss and electromagnetic ion cyclotron waves. Furthermore, our results emphasize the complexity of radiation belt dynamics and the importance of wave-driven precipitation loss even during nonstorm times.
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [1] ;  [1] ;  [1] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Univ. of New Hampshire, Durham, NH (United States). Dept. of Physics
  6. Univ. of Colorado, Boulder, CO (United States)
  7. The Aerospace Corp., Los Angeles, CA (United States)
  8. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2169-9380
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Name: Journal of Geophysical Research. Space Physics; Journal ID: ISSN 2169-9380
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
58 GEOSCIENCES heliospheric and magnetospheric physics