1. Department of Atmospheric, Oceanic and Space Sciences; University of Michigan; Ann Arbor Michigan USA
2. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
3. Solar-Terrestrial Environment Laboratory; Nagoya University; Nagoya Japan
4. Department of Earth and Planetary Science; University of Tokyo; Tokyo Japan
5. Planetary Plasma and Atmospheric Research Center; Tohoku University; Sendai Japan
6. Institute of Space and Astronautical Science; Sagamihara Japan
7. Center for Geospace Studies; SRI International; Menlo Park California USA
8. Space Sciences Laboratory; University of California; Berkeley California USA