1. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
2. Physics and Astronomy Department Eastern Michigan University Ypsilanti MI USA
3. Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA
4. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
5. High Altitude Observatory National Center for Atmospheric Research Boulder CO USA
6. Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory Princeton University Princeton NJ USA
7. Space Sciences Laboratory University of California Berkeley CA USA
8. NASA Goddard Space Flight Center Greenbelt MD USA