1. Department of Atmospheric and Oceanic Sciences; University of California; Los Angeles California USA
2. Solar-Terrestrial Environment Laboratory; Nagoya University; Nagoya Japan
3. Department of Earth and Space Sciences; University of California; Los Angeles California USA
4. Department of Physics and Astronomy; University of Calgary; Calgary Alberta Canada
5. Space Science Laboratory; University of California; Berkeley California USA
6. National Institute of Information and Communications Technology; Tokyo Japan