Abstract
Proper motion measurements of solar granulation made by local cross-correlation analysis of a 190 minute time series of white-light images reveal persistent flows with scales of 5-50 Mm. The two-dimensional horizontal flow shows mainly the horizontal supergranulation, and the divergence of the flow, of the 5-10 Mm mesogranulation. Time-averaged Doppler vertical velocities in the photospheric Fe I 5576 A and in the temperature minimum Mg I b2 5173 A lines are correlated with the flow divergence. The time-averaged chromospheric intensity in Mg I b2 is correlated with the flow divergence. Fourier spectrum and autocorrelation analyses of the flow divergence gives a measure of 6.6 Mm in the principal component and indicates little power at scales larger than 15 Mm.
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