1. Institute of Applied Physics and Computational Mathematics Beijing China
2. School of Earth and Space Sciences Peking University Beijing China
3. Space Sciences Laboratory University of California Berkeley CA USA
4. William B. Hanson Center for Space Sciences University of Texas at Dallas Richardson TX USA
5. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
6. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA