1. Institute of Space Physics and Applied Technology; Peking University; Beijing China
2. Center for Atmospheric Research; University of Massachusetts; Lowell Massachusetts USA
3. NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. CCLRC Rutherford Appleton Laboratory; Didcot UK
5. Center for Space Physics; Boston University; Boston Massachusetts USA
6. Space Science Center; University of New Hampshire; Durham New Hampshire USA
7. Max-Planck-Institut für Sonnensystemforschung; Katlenburg-Lindau Germany
8. Department of Physics; University of Oslo; Oslo Norway