1. Laboratory for Atmospheric and Space Physics Boulder CO USA
2. Emeritus Professor, Imperial College London London UK
3. University of New Hampshire Durham NH USA
4. Goddard Space Flight Center Greenbelt MD USA
5. Space Sciences Laboratory Berkeley CA USA
6. Space Exploration Sector, The Johns Hopkins Applied Physics Laboratory Laurel MD USA
7. Physics and Astronomy University of Southampton Southampton UK
8. Southwest Research Institute San Antiono TX USA
9. UCLA Los Angeles CA USA