*原田 裕己¹、Halekas Jasper²、DiBraccio Gina³、Xu Shaosui⁴、Ruhunusiri Suranga²、原 拓也⁴、Espley Jared³、McFadden James⁴、Mitchell David⁴、Mazelle Christian⁵ (1.京都大学大学院理学研究科、2.Department of Physics and Astronomy, University of Iowa、3.NASA Goddard Space Flight Center、4.Space Sciences Laboratory, University of California, Berkeley、5.IRAP, University of Toulouse, CNRS, UPS, CNES)