Fig. 6From: Relationship between topography, tropospheric wind, and frequency of mountain waves in the upper mesosphere over the Kanto area of JapanElevation and azimuth angles fitted to an airglow image. Red contour lines show elevation angles, and red dashed lines show azimuth angles. The right and top sides of the image indicate south and west, respectively. The azimuth is set to 0° northward and increases counterclockwise in an imageBack to article page