Kanako Seki¹, Kunihiro Keika², Satoshi Kasahara¹, Shoichiro Yokota³, Tomoaki Hori⁴, Kazushi Asamura⁵, Nana Higashio¹, Masayoshi Takada¹, Yasunobu Ogawa⁶, Ayako Matsuoka⁵, Mariko Teramoto⁷, Yoshizumi Miyoshi⁴ and Iku Shinohara⁵, (1)University of Tokyo, Department of Earth and Planetary Science, Bunkyo-ku, Japan, (2)The University of Tokyo, Tokyo, Japan, (3)Osaka University, Osaka, Japan, (4)Nagoya University, ISEE, Nagoya, Japan, (5)ISAS/JAXA, Sagamihara, Japan, (6)NIPR National Institute of Polar Research, Tokyo, Japan, (7)Kyushu Institute of Technology, Tobata, Japan