1. Department of Space Physics School of Electronic Information Wuhan University Wuhan China
2. Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei China
3. Section 2.7 Space Physics and Space Weather GFZ German Research Centre for Geosciences Potsdam Germany
4. Institute of Physics and Astronomy University of Potsdam Potsdam Germany
5. Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA