*Shoko OHTSUKI¹, Naomoto IWAGAMI², Severine ROBERT³, Hideo SAGAWA⁴, Toru KOUYAMA⁵, Takao M. SATO⁶ (1.Senshu University, 2.University of Tokyo, 3.Belgian Institute for Space Aeronomy, 4.National Institute of Information and Communications Technology, 5.Information Technology Research Institute, 6.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)