1. Center for Space Physics; Boston University; Boston MA USA
2. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles CA USA
3. Southwest Research Institute; San Antonio TX USA
4. Department of Physics and Astronomy; University of Texas at San Antonio; San Antonio TX USA
5. The Johns Hopkins University Applied Physics Laboratory; Laurel MD USA
6. Department of Physics and Astronomy; University of Iowa; Iowa City IO USA
7. Goddard Space Flight Center; Greenbelt MD USA