1. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA
2. Department of Atmospheric and Oceanic Sciences University of Colorado Boulder CO USA
3. Department of Mechanical, Materials, and Aerospace Engineering Illinois Institute of Technology Chicago IL USA
4. High Altitude Observatory, National Center for Atmospheric Research Boulder CO USA
5. Department of Atmospheric Sciences Hampton University Hampton VA USA
6. Space Science Division Naval Research Laboratory Washington DC USA
7. Department of Physics Norwegian University of Science and Technology Norway
8. Birkeland Centre for Space Science, University of Bergen Bergen Norway