Multisatellite Observations of the Energetic Electron Response to the May 1998 Magnetic Storm

J. F. Fennell, J. L. Roeder, J. B. Blake, R. S. Selesnick (The Aerospace Corporation, Los Angeles, CA, 90009-2957; 1-310-336-7075; e-mail:joseph.fennell@ G. Reeves and R. H. W. Friedel (Los Alamos National Laboratory, Los Alamos, NM) M. Grande and M. Carter (Rutherford Appleton Laboratory, Chilton-Didcot, United Kingdom)

We combine the energetic electron observations from Polar and HEO (94-026, 95-034, and 97-068) satellites taken during the large magnetic storm of May 2-9, 1998. These observations are taken at high-altitudes and high-inclinations at energies > 100 keV. The HEO (94-026, 95-034, and 97-068) satellites are in ~12 hour orbits at different local times while Polar is in an 18 hour orbit. The HEO coverage occurs roughly in the pre-noon/pre-midnight, post-noon/post-midnight and dawn/ dusk regions of the inner magnetosphere. Polar covers the pre-noon/pre-midnight region. HEO 94-026 and 95-034 provide coverage generally for L > 4 while HEO 97-068 covers L > 2 and Polar covers L > 3. These data are combined to provide a picture of the evolution of the energetic electrons with time, local time, L, and energy. These combined observations will be presented and discussed in terms of the development of the storm from the electron perspective at mid to high latitude. We will also compare these off-equator observations to the observations taken near the equator by LANL geosynchronous and GPS satellites.