Trapped kilovolt electrons at low L-values

Summary form only given, as follows. A survey of low-energy electron spectra measured by the LEPA instrument on the CRRES spacecraft has uncovered a trapped low-energy electron population at L-values down to 1.8. Electrons in the 0.2-30 keV energy range have penetrated deeply into the magnetosphere on a number of occasions. LEPA data have been obtained for two orbits, one on January 20, 1991, the other on January 30, 1991, which show these trapped populations. The trapped electrons consist of discrete energy bands. The reason that electrons are found in discrete energy bands and not a continuous distribution is not known. The L-distribution of the five bands of trapped electrons measured on these two orbits is consistent with adiabatic acceleration. The possible acceleration mechanisms of these low-energy electrons have been considered. Pitch-angle distributions, distribution functions of the electrons, and the distributions of number density with radial distance have also been obtained.