1. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
2. Department of Astronomy and Space Science; Chungbuk National University; Cheongju South Korea
3. Center for Geospace Studies; SRI International; Menlo Park California USA
4. Department of Earth and Space Sciences, Institute for Geophysics and Planetary Physics; University of California; Los Angeles California USA
5. Space Sciences Laboratory; University of California; Berkeley California USA
6. Institut für Geophysik und Extraterrestrische Physik; Technische Universität Braunschweig; Braunschweig Germany