1. School of Space and Environment; Beihang University; Beijing China
2. Swedish Institute of Space Physics; Uppsala Sweden
3. School of Electronic and Information; Wuhan University; Wuhan China
4. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
5. NASA Goddard Space Flight Center; Greenbelt Maryland USA
6. Space and Plasma Group; Royal Institute of Technology; Stockholm Sweden
7. Physics Department and Space Science Center; University of New Hampshire; Durham New Hampshire USA
8. Department of Astrophysical and Planetary Sciences; University of Colorado Boulder; Boulder Colorado USA
9. Laboratoire de Physique des Plasmas; CNRS-Ecole Polytechnique-UPMC; Palaiseau France
10. Southwest Research Institute; San Antonio Texas USA