In order to measure the charged massive particles encountered by
satellites in space, the Paul Scherrer Institute has developed in
collaboration with the Swiss Compagnie Industrielle Radioelectrique, CIR
under ESA contract No. 11108/94/N1/JG(SC) the Radiation Environment
The REM instrument provides local particle fluxes with some
discrimination in both, particle species and energy.
In the period from 1994 to 1998 two REM instruments were operational in
space and delivered a wealth of data.