1. Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
2. College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China
3. Mohe Observatory of Geophysics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
4. Department of Physics at Umeå University Umeå Sweden
5. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
6. Beijing International Center for Mathematical Research Peking University Beijing China
7. Princeton Plasma Physics Laboratory Princeton University Princeton NJ USA
8. Department of Astrophysical Sciences Princeton University Princeton NJ USA
9. Swedish Institute of Space Physics Kiruna Sweden