1. School of Earth and Space Science; Peking University; Beijing; 100871; China
2. Institute of Plasma Physics; Chinese Academy of Sciences; Hefei; 230026; China
3. The National Astronomical Observatories; Chinese Academy of Sciences; Beijing; 100012; China
4. Center for Space Science and Applied Research; Chinese Academy of Sciences; Beijing; 100080; China
5. Space Science and Technology Department; Rutherford Appleton Laboratory; UK
6. Max-Planck-Institute for Solar System Research; Germany
7. CSP; Boston University; US
8. The Blackett Laboratory; Imperial College London; UK
9. CNSR; France
10. IGM; TU Braunschweig; Germany