1. Department of Electrical and Computer Engineering and Center for Space Physics Boston University Boston MA USA
2. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
3. The Aerospace Corporation Los Angeles CA USA
4. Department of Physics and Astronomy University of Calgary Calgary Alberta Canada
5. SRI International Menlo Park CA USA
6. Department of Earth, Planetary and Space Sciences University of California Los Angeles CA USA
7. Department of Physics University of Alaska Fairbanks Fairbanks AK USA
8. MIT Haystack Observatory Westford MA USA