1. Applied Physics Laboratory Johns Hopkins University Laurel MD USA
2. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
3. Department of Physics University of Maryland College Park MD USA
4. Space Science and Engineering Division Southwest Research Institute San Antonio TX USA
5. Department of Physics and Astronomy University of Texas at San Antonio San Antonio TX USA
6. Geophysical Institute University of Alaska Fairbanks Fairbanks AK USA