1. CAS Key Laboratory of Geospace Environment, School of Earth and Space SciencesUniversity of Science and Technology of China Hefei China
2. High Altitude ObservatoryNational Center for Atmospheric Research Boulder CO USA
3. Department of Earth SciencesUniversity of Hong Kong Pokfulam Hong Kong
4. Laboratory for Space ResearchUniversity of Hong Kong Pokfulam Hong Kong
5. MIT Haystack Observatory Westford MA USA