1. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA
2. Department of Earth, Planetary and Space Sciences and Institute of Geophysics and Planetary Physics University of California Los Angeles CA USA
3. Department of Physics and Engineering Physics University of Saskatchewan Saskatoon Saskatchewan Canada
4. Department of Physics and Astronomy University of Calgary Calgary Alberta Canada
5. Department of Astronomy and Center for Space Physics Boston University Boston MA USA
6. Department of Electrical and Computer Engineering and Center for Space Physics Boston University Boston MA USA