1. Department of Physics and Astronomy Rice University Houston Texas USA
2. Now at William B. Hanson Center for Space Sciences University of Texas at Dallas Richardson Texas USA
3. Space Sciences Department The Aerospace Corporation El Segundo California USA
4. Department of Physics and Astronomy West Virginia University Morgantown West Virginia USA
5. Space Science and Applications Group Los Alamos National Laboratory Los Alamos New Mexico USA
6. Air Force Research Laboratory Space Vehicles Directorate Kirtland Air Force Base New Mexico USA
7. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder Colorado USA