1. Department of Physics Augsburg University Minneapolis MN USA
2. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
3. Space Research Institute Moscow Russia
4. Now at Department of Physics University of Minnesota Minneapolis MN USA
5. Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA
6. Space Science Institute Boulder CO USA
7. Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA
8. DTU Space Kongens Lyngby Denmark
9. British Antarctic Survey Cambridge UK
10. Department of Physics New Jersey Institute of Technology Newark NJ USA