1. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
2. Physics Department, W. B. Hanson Center for Space Sciences; University of Texas at Dallas; Richardson Texas USA
3. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
4. Space Science and Applications Group; Los Alamos National Laboratory; Los Alamos New Mexico USA
5. Institute for the Study of Earth, Oceans, and Space; University of New Hampshire; Durham New Hampshire USA