1. Laboratory for Atmospheric and Space Physics; Boulder CO USA
2. Department of Astrophysical and Planetary Sciences; University of Colorado Boulder; Boulder CO USA
3. Department of Physics; University of Colorado Boulder; Boulder CO USA
4. Laboratoire de Physique des Plasmas, CNRS/Ecole Polytechnique/Sorbonne Université/Université de Paris Sud/Observatoire de Paris; Paris France
5. Department of Physics; University of New Hampshire; Durham NH USA
6. NASA Goddard Space Flight Center; Greenbelt MD USA
7. Department of Earth, Planetary, and Space Sciences; University of California; Los Angeles CA USA
8. Southwest Research Institute; San Antonio TX USA