Abstract

We analysed the variations of radiation belt electrons observed during 14-24 April 2002 obtained on board CORONAS-F satellite (polar orbit at altitude of ∼500 km). Measurements of April 14 and 16 correspond to the quiet state of the radiation belts before a magnetic storm. The first storm connected with the M1/CME which occurred April 15 was observed near noon of the following day, next magnetic storm, connected with M2/CME which took place April 17, occurred April 19. As consequence the short time interval between both events strong changes have been observed in the Earth's radiation belt. Significant decrease of electron fluxes in wide energy range was observed in the outer radiation belt April 17 and early morning April 18. During April 18 and 19 the electron flux intensity increased in the outer radiation belt and the location of the peak flux shifted from 4.5 to 3.2 in the nightside and from 5 to 3.5 in the dayside. The next increase of electron flux was observed after the next magnetic storm during April 19-20 both in the inner and outer radiation belts.

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