1. Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
2. Department of Earth, Planetary, and Space Sciences University of California Los Angeles California USA
3. Space Research Institute Austrian Academy of Sciences Graz Austria
4. School of Mathematical and Physical Sciences University of Newcastle Callaghan New South Wales Australia
5. NASA Goddard Space Flight Center Greenbelt Maryland USA
6. Institute for the Study of Earth, Oceans, and Space University of New Hampshire Durham New Hampshire USA
7. Southwest Research Institute San Antonio Texas USA