1. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
2. Center for Space Physics; Boston University; Boston Massachusetts USA
3. Department of Earth, Planetary, and Space Sciences; University of California; Los Angeles California USA
4. The Johns Hopkins University; Applied Physics Laboratory; Laurel Maryland USA
5. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
6. Goddard Space Flight Center; NASA; Greenbelt Maryland USA
7. Department of Astrophysical and Planetary Sciences and Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
8. Space Science and Engineering Division; Southwest Research Institute; San Antonio Texas USA