1. Space Sciences Laboratory, University of California, Berkeley, California 94720, USA
2. University of Colorado LASP, Boulder, Colorado 80303, USA
3. Space Science and Engineering, Southwest Research Institute, Durham, New Hampshire 03824, USA
4. University of Maryland, College Park, Maryland 20742, USA
5. Dartmouth College, Hanover, New Hampshire 03755, USA
6. University of Hawaii, Honolulu, Hawaii 96822, USA
7. The Blackett Laboratory, Imperial College London, London SW7 2BX, United Kingdom
8. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
9. Birkeland Centre for Space Science, University of Bergen, 5007 Bergen, Norway
10. Max-Planck Institute for Solar Systems Research, 37077 Göttingen, Germany
11. Southwest Research Institute, San Antonio, Texas 78238, USA
12. University of New Hampshire, Durham, New Hampshire 03824, USA
13. Swedish Institute of Space Physics, 75237 Uppsala, Sweden
14. University of California, Los Angeles, Los Angeles, California 90095, USA
15. NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA