Statistical analysis of wave parameters of polar-type medium-scale travelling ionospheric disturbances observed by a 630-nm airglow imager at Nyrölä, Finland

Masaki Sato, Organization Not Listed, Washington, DC, United States, Shiokawa Kazuo, ISEE, Nagoya University, Nagoya, Japan, Shin-ichiro Oyama, National Institute of Polar Research, Tokyo, Japan, Yuichi Otsuka, Nagoya University, Institute for Space-Earth Environmental Research, Nagoya, Japan and Arto Oksanen, Jyväskylän Sirius ry, Jyväskylä, Finland