R S Selesnick, J B Blake, W A Kolasinski The Aerospace Corporation, Los Angeles, CA 90009

G D Reeves Los Alamos National Laboratory, Los Alamos, NM 87545

T A Fritz Boston University, Boston, MA 02215

During the January 10-11 interaction of the magnetosphere with a coronal mass ejection and associated interplanetary magnetic cloud, the intensity of the relativistic radiation belt electrons rapidly increased. Observations by instrumentation on the POLAR satellite provided radial profiles of the intensity and phase space density before and after the event, while continuous monitoring was provided by the LANL geosynchronous satellites. From a comparison of these data sets we discuss the location and time of the electron acceleration, and the subsequent radiation belt dynamics.