On 24 March 1991 instrumentation aboard CRRES observed the almost instantaneous injection of electrons and protons with energies above 15 MeV into the L‐region 2 < L < 3. The energy spectrum of the injected electrons, a power law (E−6) peaked at 15 MeV and continued to at least 50 MeV

Abstract.During a •3 month period in mid-1996 outer radiation belt electrons in the energy range from •3 to 8 MeV were diffusing inward and decaying in intensity with no internal or external source.Measurements from the HIST instrument on POLAR are used to constrain a model for time dependent lossy radial diffusion of these electrons, and to obtain estimates of a parameterized radial diffusion coefficient and lifetime. For lower energy electrons, of HI to 3 MeV, a source at L > 6 is apparent throughout most of the same period.

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