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Title: Ultra-low-frequency wave-driven diffusion of radiation belt relativistic electrons

The Van Allen radiation belts are typically two zones of energetic particles encircling the Earth separated by the slot region. How the outer radiation belt electrons are accelerated to relativistic energies remains an unanswered question. Recent studies have presented compelling evidence for the local acceleration by very-low-frequency (VLF) chorus waves. However, there has been a competing theory to the local acceleration, radial diffusion by ultra-low-frequency (ULF) waves, whose importance has not yet been determined definitively. Here we report a unique radiation belt event with intense ULF waves but no detectable VLF chorus waves. So, our results demonstrate that the ULF waves moved the inner edge of the outer radiation belt earthward 0.3 Earth radii and enhanced the relativistic electron fluxes by up to one order of magnitude near the slot region within about 10 h, providing strong evidence for the radial diffusion of radiation belt relativistic electrons.
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [1] ;  [3] ;  [1] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Changsha Univ. of Science and Technology (China)
  3. Peking Univ., Beijing (China)
  4. Harbin Inst. of Technology (China). Shenzhen Graduate School
  5. Univ. of Colorado, Boulder, CO (United States)
  6. Univ. of New Hampshire, Durham, NH (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Aerospace Corporation, Los Angeles, CA (United States)
  9. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 2041-1723; ncomms10096
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
Country of Publication:
United States
58 GEOSCIENCES physical sciences; astronomy