Fig. 4From: Relationship between topography, tropospheric wind, and frequency of mountain waves in the upper mesosphere over the Kanto area of JapanGeographical projection of an OH airglow image acquired at 2:53 JST on January 18, 2019. The image also shows the effective field of view at the altitude of the OH airglow layer (85 km). The red star indicates the location of the observation siteBack to article page