1. Department of Atmospheric and Oceanic Sciences; University of Colorado Boulder; Boulder CO USA
2. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder CO USA
3. National Center for Atmospheric Research; Boulder CO USA
4. High-Altitude Observatory; National Center for Atmospheric Research; Boulder CO USA
5. NASA Goddard Space Flight Center; Greenbelt MD USA
6. Massachusetts Institute of Technology Haystack Observatory; Westford MA USA