Radiation-belt and transient solar-magnetospheric effects on Hipparcos radiation background

The Hipparcos astrometry satellite operated in a near-geostationary transfer orbit between August 1989 and August 1993. Its telescopes were sensitive to background signals induced by energetic electrons and protons, and by bremsstrahlung. The observations yielded a long-term data-set which strongly reflects the structure of the radiation belts, their dynamics and the effects of solar particle events. Investigation of these data includes qualitative comparisons with GOES and CRRES data. >

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