Observations of the outer radiation belt with REM and comparisons with models

Radiation Environment Monitors (REMs) on-board the STRV-1b spacecraft in ge ostationary transfer orbit (GTO) and externally on Mir have returned valuab le results over the last few years. STRV data show the great variability of the electron radiation belt and a stable proton belt feature. In this pape r, a detailed assessment is made of the flux values derived from the REM on STRV and particularly how they compare with the AE-8 and CRRESELE electron radiation-belt models. To compare with CRRESELE, the activity index Ap,, i s used and the behavior of this index as a parameter is assessed. GOES data are used to aid this assessment.