1. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
2. Department of Astrophysical Sciences Princeton University Princeton NJ USA
3. Southwest Research Institute San Antonio TX USA
4. Physics and Astronomy Department University of Texas at San Antonio San Antonio TX USA
5. LASP University of Colorado Boulder CO USA
6. Space Research Corporation Annapolis MD USA
7. Department of Physics and Astronomy University of Iowa Iowa City IA USA
8. School of Physics and Astronomy University of Minnesota Minneapolis MN USA