Fig. 10From: Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studiesComparison of (a) eastward and (b) northward wind velocities obtained by FP02, FP03, and PF04 for 630.0-nm airglow at Shigaraki on August 17, 2009. The eastward wind velocities of FP04 were not available due to an error of the sky scanner.Back to article page