On the Correlation Between Granule and Supergranule Intensity Fields

Simultaneous photographs taken in Ha (AX = +0.6 A) and in white light (X 6400 A) show a correlation in intensity features of +0.25; i.e., that dark (bright) features in one correspond to dark (bright) ones in the other. It is suggested that the correlation could arise both from the velocity pattern in a supergranule and from temperature variations across such a cell.