1. Geophysical Institute University of Alaska Fairbanks Fairbanks AK USA
2. Department of Earth and Planetary Sciences Johns Hopkins University Laurel MD USA
3. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA
4. Department of Astrophysical Sciences Princeton University Princeton NJ
5. Southwest Research Institute San Antonio TX USA
6. Johns Hopkins University Applied Physics Laboratory Johns Hopkins University Laurel MD USA
7. NASA Ames Research Center, Moffett Field CA USA
8. Southwest Research Institute Boulder CO USA