Asuka Hirai¹, Fuminori Tsuchiya¹, Takahiro Obara¹, Yasumasa Kasaba¹, Yuto Katoh¹, Hiroaki Misawa¹, Kazuo Shiokawa², Yoshizumi Miyoshi³, Satoshi Kurita⁴ and Martin G Connors⁵, (1)Tohoku University, Sendai, Japan, (2)Nagoya Univ, Aichi, Japan, (3)Nagoya University, ISEE, Nagoya, Japan, (4)ISEE, Nagoya University, Nagoya City, Japan, (5)Athabasca University, Athabasca, AB, Canada