1. Institute for the Study of Earth, Oceans, and Space; University of New Hampshire; Durham New Hampshire USA
2. Emeritus, NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
4. Department of Atmospheric and Oceanic Sciences; University of Colorado Boulder; Boulder Colorado USA
5. High Altitude Observatory; National Center for Atmospheric Research; Boulder Colorado USA