Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

School of Earth and Space Sciences, Peking University, Beijing, China

Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Institute of Solar-Terrestrial Physics, Russian Academy of Sciences, Irkusk, Russia

School of Physics, Peking University, Beijing, China

School of Physics, Peking University, Beijing, China

Department of Geophysics and Planetary Sciences, USTC, Hefei, China

Space Research Institute, Austrian Academy of Sciences, Graz, Austria

Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, USA

Space Sciences Laboratory, University of California, Berkeley, CA, USA

TUBS, 38106 Braunschweig, Germany

Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany