On the rms intensity fluctuation of solar granulation

Using a selected high definition granulation photograph obtained with a 40 cm aperture telescope from the ground, a new determination of the rms intensity fluctuation is attempted. We find, at 5500 Å, a value of 0.058 without, of 0.067 with correction for theoretical diffraction only, and 0.095 ± 0.015 as the most probable value, if the differences between our power spectrum and those given in the literature is interpreted as due to a residual seeing of = 0.3 in our photograph.Mitteilungen aus dem Fraunhofer Institut Nr. 104.