Abstract
A computational model of random perturbations induced in wavefronts in the entry pupil of telescopes of moderate aperture has been constructed and used to predict the instantaneous distribution of intensity in the perturbed stellar images formed by such telescopes. Parameters of the model have been chosen to give a reasonably life-like imitation of perturbations due to imperfect ‘seeing’; and in order to gain some idea of the adequacy of the model, instantaneous intensity distributions in images of α-Aur have been obtained by computer reduction of observations made at the Cambridge 36-inch telescope using a spectracon electrono-graphic image tube. The model and its predictions are described and compared with the observations.
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