[Tang, Lijun; Xiao, Fuliang; He, Zhaoguo] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
[Xiao, Fuliang] Chinese Acad Sci, Sate Key Lab Space Weather, Beijing 100190, Peoples R China.
[Zong, Qiugang; Wang, Chengrui] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
[Su, Zhenpeng] Univ Sci & Technol China, CAS Key Lab Basic Plasma Phys, Sch Earth & Space Sci, Hefei 230026, Peoples R China.