1. Space Sciences Laboratory; University of California; Berkeley California USA
2. AOSS Department; University of Michigan; Ann Arbor Michigan USA
3. Institute of Geophysics and Planetary Physics; UCLA; Los Angeles California USA
4. NASA/Goddard Space Flight Center; Greenbelt Maryland USA
5. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
6. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
7. CNRS, IRAP; Toulouse France
8. University Paul Sabatier; Toulouse France