Thermospheric wind variations observed by a Fabry-Perot interferometer at Tromsoe, Norway, at substorm onsets

Heqiucen Xu1, Kazuo Shiokawa1, Shin-ichiro Oyama2 and Yuichi Otsuka3, (1)Nagoya University, Institute for Space-Earth Environmental Research, Nagoya, Japan, (2)ISEE, Nagoya University, Nagoya, Japan, (3)Nagoya University, ISEE, Nagoya, Japan