Abstract
The particle space radiation environment is reviewed and some of the latest models for the various phenomena are presented. The properties of the solar wind and interplanetary magnetic fields based on recent satellite measurements are given and solar proton events are discussed. The magnetospheric cavity and the character of the boundary between it and the solar wind based on Imp 1 results are shown. Flux maps and energy spectra for the inner and outer radiation zones are given and examples of temporal variations are shown.