1. CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science; University of Science and Technology of China; Hefei China
2. Mengcheng National Geophysical Observatory, School of Earth and Space Sciences; University of Science and Technology of China; Hefei China
3. Institute of Geology and Geophysics; Chinese Academy of Sciences; Beijing China
4. Center for Atmospheric Sciences; Hampton University; Hampton Virginia USA