1. Applied Physics Laboratory; Johns Hopkins University; Laurel Maryland USA
2. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
3. Centre d'Etude des Environnements Terrestre et Planétaires; Institut Pierre-Simon Laplace; Velizy France
4. Space Sciences Laboratory; University of California; Berkeley California USA
5. Department of Physics and Astronomy; University of Calgary; Calgary, Alberta Canada
6. NASA Goddard Space Flight Center; Greenbelt Maryland USA
7. Laboratory for Atmospheric and Space Physics; University of Colorado; Boulder Colorado USA
8. Institut für Geophysik und Extraterrestrische Physik; Technische Universität Braunschweig; Braunschweig Germany
9. Department of Geophysics, Graduate School of Science; Kyoto University; Kyoto Japan