1. Department of Space Physics, School of Electronic Information Wuhan University Wuhan China
2. Department of Atmospheric and Oceanic Sciences University of California Los Angeles California USA
3. State Key Laboratory of Space Weather Chinese Academy of Sciences Beijing China
4. Department of Earth, Planetary, and Space Sciences University of California Los Angeles California USA
5. Institute of Geophysics and Planetary Physics, Department of Earth and Space Sciences University of California Los Angeles California USA