2018年5月21日 3D current system of eastward expanding auroral surges Japan Geoscience Union Meeting 2018 Yoshimasa Tanaka, Yasunobu Ogawa, Akira Kadokura, Bjorn Gustavsson, Noora Partamies, Kirsti Kauristie, Daniel Whiter, Carl-fredrik Enell, Urban Brandstrom, Tima Sergienko, Alexander Kozlovsky, Heikki Vanhamaki, Akimasa Yoshikawa, Hiroshi Miyaoka