Variations of the outer radiation belt during the last two years

Statistics – Applications

Scientific paper

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Scientific paper

The Radiation Environment Monitor, REM, is an instrument for monitoring high energy proton and electron fluxes on board spacecraft. A REM instrument was launched on the UK small satellite STRV-1B in June 1994. STRV-1B is in a Geostationary Transfer Orbit and so passes repeatedly through the radiation belts. It is thus an excellent platform for studying the radiation environment through a range of altitudes. During the last two years the outer (electron) radiation belt has been highly variable. Recurrent fast solar wind streams have periodically compressed the earth's magnetosphere causing large variations in the detected trapped particle fluxes. In addition the effectiveness of the solar wind - magnetosphere interaction shows a semi-annual variation, with maximum effect in spring and fall and minimum in winter and summer. We present REM data together with solar wind data and discuss the relation between solar wind characteristics and the measured particle fluxes.

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