Quasi-trapped electron fluxes ( [formula omitted]) under the radiation belts: analysis of their connection with geomagnetic indices

Fluxes of energetic electrons ( >0.5 MeV ) at altitudes of about 500 km were measured onboard CORONAS-I, launched in March 1994. We found certain L-shells (2.1,1.6,1.3), where quasi-trapped electrons were observed practically permanently during March–June 1994. Distributions of the anomalous electron flux have been determined versus L, local time and universal time for Northern and Southern hemispheres. The occurrence frequencies of the peaks of electron fluxes have been correlated with geomagnetic indices variations.