Fig. 13
From: Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studies
Vertical wind measurements obtained at Poker Flat, Alaska by a 70-mm diameter Fabry-Perot interferometer with the characteristics described in this section. The exposure time for each data point is 60 s. The top panel presents the Doppler line center value in m s−1. The blue line in this panel represents the laser data points that have been shifted in phase to agree with the sky Doppler line center points measured between 20 and 22 LT. The second panel shows a plot of the differences between the Doppler line center position and the interpolated laser line center position. The dashed line indicates the nightly average (−10 m s−1) of the vertical wind differences.