An investigation has been made on a large increase in the intensity of MeV electrons in the outer radiation belt during a magnetic storm. The increase starts in the heart of the outer radiation zone late in the main phase of the magnetic storm. Electrons with intermediate-energy are injected to the heart of outer radiation zone during the storm main phase, and these electrons seed a subsequent increase in the number of the MeV electrons with possible heating/acceleration. A prolonged magnetic activity during the recovery phase of the magnetic storm leads to a fast outward diffusion of the MeV electrons, which results in a large increase in the number of MeV electrons at geostationary orbit.
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