Fig. 5From: Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studiesCross sections of one-night average fringes obtained by (a) FP01 for 557.7 nm and (b) FP01 for 630.0 nm on January 24, 2009, at Tromsø, and (c) by FP02 for 630.0 nm on August 17, 2009, at Shigaraki. The crosses indicate the 10 peak locations identified for each fringe that are used to determine the center of the circular fringes.Back to article page