1. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
2. NASA Goddard Space Flight Center Greenbelt MD USA
3. Department of Physics and Astronomy University of Iowa Iowa City IA USA
4. Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder CO USA
5. National Centers for Environmental Information Boulder CO USA
6. Space Weather Prediction Center NOAA Boulder CO USA
7. The Aerospace Corporation El Segundo CA USA
8. Department of Atmospheric and Oceanic Sciences University of California Los Angeles CA USA