Inst. of Ionosphere and Magnetosphere, College of Electronic Information, Wuhan University, China, Luojia Hill, Wuchang District, Wuhan, HB 430079 China; GeoforschungsZentrum, Potsdam, Germany, Telegrafenberg, Potsdam, D-14473 Germany
Inst. of Ionosphere and Magnetosphere, College of Electronic Information, Wuhan University, China, Luojia Hill, Wuchang District, Wuhan, HB 430079 China
Institute of Geophysics and Planetary Physics, Department of Earth and Space Sciences, University of California, USA, 3845 Slichter Hall Los Angeles, California, Los Angeles, CA 90095-1567, USA