*Taiga Osanai¹, Kei Masunaga², Naoki Terada¹, Nao Yoshida¹, Takuya Hara³, Shotaro Sakai¹ (1.Graduate School of Science, Tohoku University, 2.Institute of Space and Astronautical Science ,Japan Aerospace Exploration Agency, 3.Space Sciences Laboratory, University of California, Berkeley)