9:15 AM - 9:30 AM
*Yuko SUZUKI1, Masashi KAMOGAWA1, Yasuhiro MINAMOTO2, Akira KADOKURA3, Mitsuteru SATO4 (1.Dpt. of Phys., Tokyo Gakugei Univ., 2.Kakioka Magnetic Observatory Japan Meteorological Agency, 3.National Institute of Polar Research, 4.Department of Cosmoscience, Hokkaido University)