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The seeing β 0  over the whole atmosphere is the most important characteristic for site‐testing measurements. The estimation of the seeing using the variance of differential image motion is always biased by wind smoothing because of non‐zero exposure of the differential image motion monitor (DIMM). This results in wind smoothing. In this paper, we study the wind effects within a short‐exposure approximation (i.e. when the wind shifts the turbulence during exposure by a distance less than the device aperture). We propose a method for correcting this effect, based on the correlation of image motion between the adjacent frames. We show that the correlation can be used to estimate the mean wind speed  and the atmospheric coherence time τ 0 . We suggest using the total power of the longitudinal and transverse image motion to eliminate the dependence on wind direction. The theoretical results obtained have been tested on data gathered at Mount Shatdzatmaz during 2007–2010 using the DIMM combined with multi‐aperture scintillation sensor (MASS). Good agreement was found.

Differential image motion in the short‐exposure regime