1. Department of Electrical and Computer Engineering and Center for Space Physics Boston University Boston MA USA
2. MIT Haystack Observatory Westford MA USA
3. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
4. Department of Physics University of Texas at Arlington Arlington TX USA
5. Department of Physics University of Oslo Oslo Norway
6. Arctic Geophysics University Centre in Svalbard Longyearbyen Norway
7. Geophysical Institute University of Alaska Fairbanks Fairbanks AK USA
8. Institute for Space Earth Environmental Research Nagoya University Nagoya Japan