1. Earth and Atmospheric Sciences; Cornell University; Ithaca New York USA
2. SRI International; Menlo Park California USA
3. School of Electrical Engineering; Royal Institute of Technology; Stockholm Sweden
4. HAO NCAR; Boulder Colorado USA
5. Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
6. Space Vehicles Directorate; Air Force Research Laboratory; Albuquerque New Mexico USA
7. Plasma Physics Division; Naval Research Laboratory; Washington District of Columbia USA