1. School of Electronic Information; Wuhan University; Wuhan China
2. Laboratoire de Physique des Plasmas; CNRS-Ecole Polytechnique-UPMC; Palaiseau France
3. School of Space and Environment; Beihang University; Beijing China
4. Swedish Institute of Space Physics; Uppsala Sweden
5. Institute of Space Science and Technology; Nanchang University; Nanchang China
6. Division of Theoretical Astronomy; National Astronomical Observatory of Japan; Mitaka Japan
7. School of Physics; Liaoning University; Shenyang China