1. Department of Physics; The Catholic University of America; Washington District of Columbia USA
2. NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Laboratory for Atmospheric and Space Science; University of Colorado Boulder; Boulder Colorado USA
4. Max-Planck-Institut für Extraterrestrische Physik; Munich Germany
5. The Aerospace Corporation; El Segundo California USA
6. The Aerospace Corporation; Chantilly Virginia USA