1. State Key Laboratory of Space Weather, Center for Space Science and Applied Research; Chinese Academy of Sciences; Beijing China
2. College of Mathematics and Information Science; Henan Normal University; Xinxiang China
3. Haystack Observatory; Massachusetts Institute of Technology; Westford Massachusetts USA
4. Electrical and Computer Engineering Department; Miami University; Oxford Ohio USA
5. School of Electrical Engineering; Zhengzhou University; Zhengzhou China
6. Scientific Solutions, Inc.; North Chelmsford Massachusetts USA