Department of Geophysics, Peking University, Beijing 100871, P.R. China;
Department of Geophysics, Peking University, Beijing 100871, P.R. China;
Department of Geophysics, Peking University, Beijing 100871, P.R. China;
Department of Geophysics, Peking University, Beijing 100871, P.R. China;
Earth's radiation belts; Space energetic particles; Space weather;