Institution: | (1) Institute of Space and Astronautical Science, Meguro-ku, 4-6-1 Komaba Tokyo, Japan;(2) Physics Department, Osaka University, 1-1 Machikaneyama, Toyonaka City, Osaka, Japan;(3) Physics Department, University of California San Diego, 92093 La Jolla, CA, USA;(4) Goddard Space Flight Center, 20771 Greenbelt, MD, USA |