1. CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China
2. State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China
3. Physics Department, Auburn University, Auburn, Alabama, USA
4. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China