1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2. Beijing Key Laboratory of Space Environment Exploration, Chinese Academy of Sciences, Beijing 100190, China
3. Joint Laboratory on Occultations for Atmosphere and Climate, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
4. Key Laboratory of Science and Technology on Space Environment Situational Awareness, Chinese Academy of Sciences, Beijing 100190, China
5. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
6. National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China