1. Space Sciences Laboratory; University of California; Berkeley California USA
2. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
3. NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
5. Department of Earth and Planetary Science, Graduate School of Science; University of Tokyo; Tokyo Japan
6. IRAP, University of Toulouse, CNRS, UPS, CNES; Toulouse France