electron drift echoes in the inner magnetosphere

Abstract
A magnetospheric shock event on 24 March 1991 produced major effects in the energetic particle population in the inner magnetosphere. Electron drift echoes were observed in the range of L=2.6 to 2.1 by instrumentation on the CRRES satellite. It is inferred from the drift rate that the energy of the electrons which were observed was in the range of 12 to 25 MeV and perhaps higher.