A powerful cross-correlation method for the precise measurement of the proper motion of tracers seen on successive images of a time series of solar granulation is proposed. The time average of the spatially localized cross correlation is shown to provide a measure of the displacement that is not biased by atmospheric seeing. The technique is applied to the analysis of an 80-minute run of white-light observations made with the Sacramento Peak Vacuum Tower Telescope. From the vector displacements, solar mesogranulations and supergranulation flows having spatial scales from 10 to 40 arcsec are found, and it is noted that the measured flow amplitudes are much larger that the rms 100 m/s noise which is attributed principally to solar granulation evolution.
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November et al. (1988) studied this question.