1. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
2. Solar-Terrestrial Environment Laboratory; Nagoya University; Nagoya Japan
3. IGPP/ESS; University of California; Los Angeles California USA
4. Department of Physics and Astronomy; University of Calgary; Calgary, Alberta Canada
5. Space Sciences Laboratory; University of California; Berkeley California USA
6. Institut für Geophysik und Extraterrestrische Physik; Technische Universität Braunschweig; Braunschweig Germany