1. Institute of Geophysics and Planetary Physics; UCLA; Los Angeles California USA
2. Department of Physics and Astronomy; UCLA; Los Angeles California USA
3. Department of Earth and Space Sciences; UCLA; Los Angeles California USA
4. National Science Foundation; Arlington Virginia USA
5. Heliospheric Physics Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
6. Department of Physics and Astronomy; University of Calgary; Calgary Alberta Canada
7. Institute of Space Science and Technology; Nanchang University; Nanchang China