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Simulation of the March 24, 1991 storm sudden commencement (SSC) has illuminated the rapid formation of new radiation belts on the particle drift time scale. While this event was the most dramatic in terms of radiation belt effects of the last solar maximum, comparable signatures of such events were seen in 1962 by Explorer 15 and in 1986 by DMSP. Several smaller MeV proton events with comparable...
The spectacular enrichment of 3 He and the smaller enrichments of heavy ions in impulsive flares is discussed in the context of a resonant interaction with the same electromagnetic ion cyclotron waves. The observed abundances are used to delineate the coronal thermodynamic conditions, the scalings of the enhancements with the coronal parameters and the frequency range of the resonant waves.
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