Fig. 8From: 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) vertical, (f) eastward, and (g) northward wind velocities, measured by FP01 for 630.0-nm airglow at Tromsø on January 24, 2009, in the same format as that in Fig. 7.Back to article page