Rapid rebuilding of the outer radiation belt

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  • A. Glocer
    NASA GSFC; Greenbelt Maryland USA
  • M.-C. Fok
    NASA GSFC; Greenbelt Maryland USA
  • T. Nagai
    Tokyo Institute of Technology, Earth and Planetary Sciences; Tokyo Japan
  • G. Tóth
    Department of Atmospheric Oceanic and Space Science; University of Michigan; Ann Arbor Michigan USA
  • T. Guild
    The Aerospace Corporation; Chantilly Virginia USA
  • J. Blake
    The Aerospace Corporation; Chantilly Virginia USA

書誌事項

タイトル別名
  • RAPID REBUILDING OF THE OUTER BELT
公開日
2011-09
資源種別
journal article
権利情報
  • http://doi.wiley.com/10.1002/tdm_license_1.1
DOI
  • 10.1029/2011ja016516
公開者
American Geophysical Union (AGU)

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説明

[1] Recent observations by the radiation monitor (RDM) on the spacecraft Akebono have shown several cases of >2.5 MeV radiation belt electron enhancements occurring on timescales of less than a few hours. Similar enhancements are also seen in detectors on board the NOAA/POES and TWINS 1 satellites. These intervals are shorter than typical radial diffusion or wave-particle interactions can account for. We choose two so-called “rapid rebuilding” events that occur during high speed streams (4 September 2008 and 22 July 2009) and simulated them with the Space Weather Modeling Framework configured with global magnetosphere, radiation belt, ring current, and ionosphere electrodynamics model. Our simulations produce a weaker and delayed dipolarization as compared to observations, but the associated inductive electric field in the simulations is still strong enough to rapidly transport and accelerate MeV electrons resulting in an energetic electron flux enhancement that is somewhat weaker than is observed. Nevertheless, the calculated flux enhancement and dipolarization is found to be qualitatively consistent with the observations. Taken together, the modeling results and observations support the conclusion that storm-time dipolarization events in the magnetospheric magnetic field result in strong radial transport and energization of radiation belt electrons.

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