1. Department of Atmospheric and Oceanic Sciences; UCLA; Los Angeles California USA
2. Space Science and Applications Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
3. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
4. Institute for the Study of Earth, Oceans, and Space; University of New Hampshire; Durham New Hampshire USA
5. The Aerospace Corporation; Los Angeles California USA
6. School of Physics and Astronomy; University of Minnesota, Twin Cities; Minneapolis Minnesota USA