1. CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary ScienceUniversity of Science and Technology of China Hefei Anhui China
2. Mengcheng National Geophysical Observatory, School of Earth and Space SciencesUniversity of Science and Technology of China Hefei Anhui China
3. High Altitude Observatory, National Center for Atmospheric Research Boulder Colorado USA
4. Center for Atmospheric SciencesHampton University Hampton Virginia USA