Institute of Space Science, National Central University, NO300, Jhongda Rd., Jhongli City, Taoyuan, Taiwan, China

Faculty of Science, University of Tokyo, Hongo, Bunnkyo-Ku, Tokyo, Japan

Institute of Space and Astronautical Science, JAXA, 3-1-1, Sagmihara, Kanagawa, Japan

NASA Goddard Space Flight Center, Greenbelt, MD, USA

Solar Terrestrial Environment Laboratory, Nagoya University, Aichi, Japan

now at: Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA

Institute of Space Science, National Central University, NO300, Jhongda Rd., Jhongli City, Taoyuan, Taiwan, China