*Akira Kadokura¹, Yasunobu Ogawa¹, Yoshimasa Tanaka¹, Hisao Yamagishi¹, Masaki Okada¹, Ryuho Kataoka¹, Herbert Akihito Uchida², Yuichi Otsuka³, Tetsuo Motoba⁴, Natsuo Sato¹ (1.National Institute of Polar Research, 2.Japan Aerospace Exploration Agency, 3.Nagoya University, 4.Johns Hopkins University, Applied Physics Laboratory)