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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 6 | Copyright
Ann. Geophys., 25, 1359-1364, 2007
https://doi.org/10.5194/angeo-25-1359-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Jun 2007

29 Jun 2007

Electron flux enhancement in the inner radiation belt during moderate magnetic storms

H. Tadokoro1, F. Tsuchiya1, Y. Miyoshi2, H. Misawa1, A. Morioka1, and D. S. Evans3 H. Tadokoro et al.
  • 1Planetary Plasma and Atmospheric Research Center, Tohoku University, Aoba-ku, Sendai, 980-8578, Japan
  • 2Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, 464-8601, Japan
  • 3Space Environment Center, NOAA, Boulder, CO 80305, USA

Abstract. During moderate magnetic storms, an electron channel (300–1100 keV) of the NOAA satellite has shown sudden electron flux enhancements in the inner radiation belt. After examinating the possibility of contamination by different energetic particles, we conclude that these electron flux enhancements are reliable enough to be considered as natural phenomena, at least for the cases of small to moderate magnetic storms. Here, we define small and moderate storms to be those in which the minimum Dst ranges between −30 and −100 nT. The electron flux enhancements appear with over one order of magnitude at L~2 during these storms. The enhancement is not accompanied by any transport of electron flux from the outer belt. Statistical analysis shows that these phenomena have a duration of approximately 1 day during the period, starting with the main phase to the early recovery phase of the storms. The flux enhancement shows a dawn-dusk asymmetry; the amount of increased flux is larger in the dusk side. We suggest that this phenomenon could not be caused by the radial diffusion but would be due to pitch-angle scattering at the magnetic equator. The inner belt is not in a stationary state, as was previously believed, but is variable in response to the magnetic activity.

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