RADIATION ENVIRONMENT MONITOR

The Radiation Environment Monitor (REM) is a modular, programmable mon itor for the radiation environment on spacecrafts. REM accumulates dif ferential linear energy transfer spectra of two independent silicon de tectors with different shieldings. The instrument is sensitive to prot ons with energies between 30 MeV and 600 MeV and to electrons with ene rgies between 1 MeV and 10 MeV. During the year 1994 two REM instrumen ts were launched into space, one into a geostationary transfer orbit a nd one into a low earth orbit. Both instruments are working well and p rovide simultaneous information on the space radiation environment of different orbits.