1. Department of Electrical and Computer Engineering; University of California, San Diego; La Jolla California USA
2. California Space Institute; University of California, San Diego; La Jolla California USA
3. Instituto de Geofisica; Universidad Nacional Autonoma de Mexico; Mexico City Mexico
4. Institute of Geophysics and Planetary Physics; University of California, Los Angeles; Los Angeles California USA
5. NASA Goddard Space Flight Center; Greenbelt Maryland USA