Fig. 7From: Observations of equatorial plasma bubbles using a low-cost 630.0-nm all-sky imager in Ishigaki Island, JapanCombination of two all-sky airglow imagers in Ishigaki Island, Japan and Tainan, Taiwan: a combined images from the two stations at 1355 UT on March 16, 2015; b east to west keogram made by combining deviation data from two stationsBack to article page