Yuki Kawamura, University of Electro-Communications, Tokyo, Japan, Keisuke Hosokawa, Univ Electro-Communications, Chofu, Japan, Shin-ichiro Oyama, Nagoya Univ., Nagoya, Japan, Yoshizumi Miyoshi, Nagoya University, ISEE, Nagoya, Japan, Yasunobu Ogawa, NIPR National Institute of Polar Research, Tokyo, Japan, Satoshi Kurita, ISEE, Nagoya University, Nagoya City, Japan and Ryoichi Fujii, Nagoya Univ, Nagoya, Japan