1. Johns Hopkins Applied Physics Laboratory Laurel MD USA
2. University of Cologne Cologne Germany
3. Southwest Research Institute San Antonio TX USA
4. University of Texas at San Antonio San Antonio TX USA
5. Department of Physics and Astronomy University of Iowa Iowa City IA USA
6. Center for Space Physics Boston University Boston MA USA
7. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA
8. Space Research Corporation Annapolis MD USA
9. NASA Goddard Space Flight Center Greenbelt MD USA
10. Department of Astrophysical Sciences Princeton University Princeton NJ USA
11. Planetary Science Institute Tucson AZ USA