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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 7
Ann. Geophys., 20, 947-951, 2002
https://doi.org/10.5194/angeo-20-947-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: SPACE WEATHER

Ann. Geophys., 20, 947-951, 2002
https://doi.org/10.5194/angeo-20-947-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Jul 2002

31 Jul 2002

Neural network prediction of relativistic electrons at geosynchronous orbit during the storm recovery phase: effects of recurring substorms

M. Fukata1, S. Taguchi1, T. Okuzawa1, and T. Obara2 M. Fukata et al.
  • 1Dept. of Information and Communication Engineering, University of Electro-Communications, Chofu, 182-8585, Japan
  • 2Communications Research Laboratory, Koganei, 184-8795, Japan
  • Correspondence to: S. Taguchi (taguchi@ice.uec.ac.jp)

Abstract. During the recovery phase of geomagnetic storms, the flux of relativistic (>2 MeV) electrons at geosynchronous orbits is enhanced. This enhancement reaches a level that can cause devastating damage to instruments on satellites. To predict these temporal variations, we have developed neural network models that predict the flux for the period 1–12 h ahead. The electron-flux data obtained during storms, from the Space Environment Monitor on board a Geostationary Meteorological Satellite, were used to construct the model. Various combinations of the input parameters AL, SAL, Dst and SDst were tested (where S denotes the summation from the time of the minimum Dst). It was found that the model, including SAL as one of the input parameters, can provide some measure of relativistic electron-flux prediction at geosynchronous orbit during the recovery phase. We suggest from this result that the relativistic electron-flux enhancement during the recovery phase is associated with recurring substorms after Dst minimum and their accumulation effect.

Key words. Magnetospheric physics (energetic particles, trapped; magnetospheric configuration and dynamics; storms and substorms)

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