Size of the Ca+ Coarse Network in the Solar Chromosphere at Sunspot Minimum

Abstract

Auto-correlation measures of the coarse Ca+ network made on selected spectroheliograms obtained during the solar minimum period of 1964 and 1965 are described. The full width at half maximum of the normalised A.C. curve gives a mean value of (31.37 ± 0.4) x 10/sup3/ km for the size of the network. The relationship between these network cells and those of the supergranulation are discussed.