Correlation Patterns in the Chromospheric Granulation

Abstract

UBEROI¹ has recently discussed a simple method of measuring the spatial correlation of the brightness fluctuations between neighbouring regions in the solar photosphere. He pointed out that, if two identical enlargements of a photograph of the solar photosphere are superimposed and one rotated from the matched position, the product of the outer radius of the circular pattern then visible and the angle of rotation gives a measure of the distance, beyond which the correlation becomes insignificant.