1. Southwest Research Institute San Antonio TX USA
2. Department of Physics and Astronomy University of Texas at San Antonio San Antonio TX USA
3. Department of Physics and Astronomy University of Iowa Iowa City IA USA
4. Institute of Geophysics and Meteorology University of Cologne Cologne Germany
5. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
6. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
7. Space Research Corporation Annapolis MD USA
8. NASA Goddard Space Flight Center Greenbelt MD USA
9. Institut de Recherche en Astrophysique et Planétologie (IRAP) Toulouse France
10. Department of Astrophysical Sciences Princeton University Princeton NJ USA