T. Kleis, A.J. Tylka, J.H. Adams, Jr., L.P. Beahm, P.R. Boberg, R. Beaujean, S. Barz, and W. Enge
The Kiel and NRL experiments aboard NASA's Long Duration Exposure Facility (LDEF) used passive track detectors to register heavy ions (E > ~15 MeV/nuc, Z > 6) in the inner magnetosphere (L < ~1.7). Our combined lookout directions cover almost all possible particle arrival directions. By examining the arrival direction distributions we identify trapped particles and direct-access particles. Trapped particles with a steeply falling spectrum dominate our data at energies below ~80 MeV/nuc. Among the identified sources of the registered particles are trapped anomalous cosmic rays (ACRs). However the presence of trapped non-ACR particles (Fe, Mg and perhaps Si and S), in our data has not yet been explained. Furthermore the angular distribution of these trapped particles is significantly broader than that of the trapped ACRs, suggesting that they were collected over a larger geographic area.