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. Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA
4. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
5. Southwest Research Institute San Antonio TX USA
6. University of Texas at San Antonio San Antonio TX USA
7. University of Iowa Iowa City IA USA