Yukinaga Miyashita, KASI Korea Astronomy and Space Science Institute, Daejeon, South Korea, Akimasa Ieda, Nagoya University, ISEE, Nagoya, Japan, Shinobu Machida, Nagoya University, Institute for Space-Earth Environmental Research, Nagoya, Japan and Vassilis Angelopoulos, University of California, Los Angeles, Department of Earth, Planetary, and Space Sciences and Institute of Geophysics and Planetary Physics, Los Angeles, CA, United States