Fig. 9From: Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studies(a) and (b) etalon gap drift, (c) fitting error, (d) peak counts, and (e) eastward and (f) northward wind velocities, measured by FP02 for 630.0-nm airglow at Shigaraki on August 17, 2009, in the same format as that in Fig. 7.Back to article page