1. CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences University of Science and Technology of China Hefei China
2. Mengcheng National Geophysical Observatory University of Science and Technology of China Hefei China
3. High Altitude Observatory National Center for Atmospheric Research Boulder CO USA
4. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
5. Beijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
6. National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation Qingdao China