1. The Blackett Laboratory, Imperial College London London UK
2. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
3. Southwest Research Institute San Antonio TX USA
4. NASA, Goddard Space Flight Center Greenbelt MD USA
5. Swedish Institute of Space Physics (Uppsala) Uppsala Sweden
6. Institut de Recherche en Astrophysique et Planétologie, CNRS, UPS, CNES Université de Toulouse Toulouse France
7. Space Science Laboratory University of California Berkeley CA USA
8. Institute of Geophysics and Planetary Physics University of California, Los Angeles Los Angeles CA USA
9. Department of Physics University of New Hampshire Durham NH USA