1. Key Laboratory of Earth and Planetary Physics, Institute of Geology and GeophysicsChinese Academy of Sciences Beijing China
2. State Key Laboratory of Space WeatherChinese Academy of Sciences Beijing China
3. College of Earth SciencesUniversity of Chinese Academy of Sciences Beijing China
4. Swedish Institute of Space Physics Uppsala Sweden
5. Max Planck Institute for Solar System Research Göttingen Germany
6. Birkeland Centre for Space Science, Department of Physics and TechnologyUniversity of Bergen Bergen Norway
7. Ludwig Maximilians University Munich Germany
8. Swedish Institute of Space Physics Kiruna Sweden