1. IGPP, ESS; University of California; Los Angeles California USA
2. Bradley Department of Electrical and Computer Engineering; Virginia Polytechnic Institute and State University; Blacksburg Virginia USA
3. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
4. Space Sciences Laboratory; University of California; Berkeley California USA
5. Technische Universität Braunschweig; Braunschweig Germany
6. Max Planck Institute for Solar System Science; Katlenburg-Lindau Germany