Differential image motion in astrometric observations with very large seeing-limited telescopes

Open Access

Fig. 6

Measured variance $σ_{a, i}^{2} (k, R)$ $\[\sigma_{\mathrm{a}, i}^{2}(k, R)\]$ at zenith for the 30 s exposure as a function of I_F metric computed at h_ref =18 km for all k modes mixed and a full data set (dot sizes show the star brightness). A linear Eq. (29) fit (solid line) visually coincides with the model dependence (21) based on the turbulence profile. Typical ranges of I_F for each k are shown.

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