1. Department of Physics; Imperial College London; London UK
2. Space Research Institute; Austrian Academy of Sciences; Graz Austria
3. Department of Astrophysical and Planetary Sciences; University of Colorado Boulder; Boulder CO USA
4. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder CO USA
5. School of Physics and Astronomy; Queen Mary University of London; London UK
6. Southwest Research Institute; San Antonio TX USA
7. University of Texas at San Antonio; San Antonio TX USA
8. NASA Goddard Space Flight Center; Greenbelt MD USA
9. Laboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique; Sorbonne Université, Université Paris Sud, Observatoire de Paris; Paris France
10. School of Electrical Engineering; KTH Royal Institute of Technology; Stockholm Sweden
11. Department of Earth, Planetary, and Space Sciences; University of California; Los Angeles CA USA
12. Department of Physics; University of New Hampshire; Durham NH USA