RELATIVISTIC ELECTRON FLUX COMPARISONS AT LOW AND HIGH-ALTITUDES WITHFAST TIME RESOLUTION AND BROAD SPATIAL COVERAGE

Analyses are presented for the first high-time resolution multisatelli te study of the spatial and temporal characteristics of a relativistic electron enhancement event with a rapid onset. Measurements of MeV el ectrons were made from two low-altitude polar orbiting satellites and three spacecraft at synchronous altitude. The electron fluxes observed by the low-altitude satellites include precipitating electrons in bot h the bounce and drift loss cones as well as electrons that are stably trapped, whereas the observations at geosynchronous altitude are domi nated by the trapped population. The fluxes of >1 MeV electrons at low -satellite altitude over a wide range of L shells tracked very well th e fluxes >0.93 MeV at synchronous altitude.