1. NASA Goddard Space Flight Center Greenbelt Maryland USA
2. Goddard Planetary and Heliophysics InstituteUniversity of Maryland, Baltimore County Baltimore Maryland USA
3. Institute of Space Physics and Applied Technology School of Earth and Space SciencesPeking University Beijing China
4. Physics Department and Geophysical InstituteUniversity of Alaska Fairbanks Fairbanks Alaska USA
5. The Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
6. Southwest Research Institute San Antonio Texas USA
7. Department of Physics and Space Science CenterUniversity of New Hampshire Durham New Hampshire USA
8. Institute of Geophysics and Planetary PhysicsUniversity of California Los Angeles California USA