1. National Space Science Center, Chinese Academy of Sciences Beijing China
2. University of Chinese Academy of Sciences Beijing China
3. Key Laboratory of Science and Technology on Environmental Space Situation Awareness CAS Beijing China
4. Department of Physics and Astronomy Clemson University Clemson SC USA
5. Haystack Observatory Massachusetts Institute of Technology Westford MA USA
6. Department of Physics University of Alberta Edmonton AB Canada
7. Department of Physics University of Texas at Arlington Arlington TX USA