1. Lunar and Planetary Laboratory; University of Arizona; Tucson Arizona USA
2. LATMOS, Université Versailles Saint-Quentin/CNRS; Guyancourt France
3. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
4. Center for Space Physics; Boston University; Boston Massachusetts USA
5. Goddard Space Flight Center; Greenbelt Maryland USA
6. Department of Atmospheric, Oceanic, and Space Sciences; University of Michigan; Ann Arbor Michigan USA