The Cosmic Radiation Environment and Dosimetry experiment (CREDO) on STRV-1a is monitoring the radiation environment in geostationary transfer orbit (GTO) and in conjunction with similar detectors in low earth orbit (LEO) affords coverage of the whole magnetosphere. Results are showing the time variability in the environment and are testing the standard models.
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Dyer et al. (1995) studied this question.
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