1. Geophysical Institute University of Alaska Fairbanks AK USA
2. Department of Atmospheric and Oceanography Science UCLA Los Angeles CA USA
3. Center for Space Physics Boston University Boston MA USA
4. Sodankylä Geophysical Observatory University of Oulu Sodankylä Finland
5. Space and Earth Observation Centre Finnish Meteorological Institute Helsinki Finland
6. Department of Earth and Space Sciences University of Washington Seattle WA USA
7. Department of Electrical Engineering University of Colorado Denver Denver CO USA
8. School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA
9. Department of Physics and Astronomy University of Calgary Calgary AB Canada
10. British Antarctic Survey Natural Environment Research Council Cambridge UK