1. Department of Physics; University of Texas at Dallas; Richardson Texas USA
2. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
3. British Antarctic Survey; Natural Environment Research Council; Cambridge UK
4. Space Science and Applications Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
5. Department of Physics and Astronomy; University of Iowa; Iowa Iowa USA
6. Institute for the Study of Earth, Oceans, and Space; University of New Hampshire; Durham New Hampshire USA
7. The Aerospace Corporation; Los Angeles California USA