Kiyoka Murase¹, Ryuho Kataoka², Takanori Nishiyama², Koji Nishimura², Taishi Hashimoto², Yoshimasa Tanaka², Akira Kadokura², Yoshihiro Tomikawa², Masaki Tsutsumi², Kaoru Sato³ and Yoshizumi Miyoshi⁴, (1)Graduate University for Advanced Studies, Tachikawa, Tokyo, Japan, (2)NIPR National Institute of Polar Research, Tachikawa, Tokyo, Japan, (3)University of Tokyo, Department of Earth and Planetary Science, Bunkyo-ku, Japan, (4)Nagoya University, ISEE, Nagoya, Japan