A quantitative study of CA II network geometry

Details A quantitative study of CA II network geometry A quantitative study of CA II network geometry

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89...35r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Nov. 1983, p. 35-42.

Physics

5

Calcium, Chromosphere, Solar Activity Effects, Solar Granulation, Spectroheliographs, Sunspots, Brightness Distribution, Correlation Coefficients, Solar Cycles, Solar Physics, Statistical Correlation

Scientific paper

Ca II spectroheliograms covering the period from 1912 to 1974 have been studied by using techniques of quantitative stereology. It is found that the fractional area α occupied by the emission network boundaries varies from 0.43 to 0.54, with the areal fraction being larger for years of sunspot minimum. The number of cells per unit area NA, decreases with increasing activity. The inner radius of the boundary wall has also been derived, as a function of epoch. While the width of the emission wall is nearly constant with activity, the average interior network cell size decreases with decreasing activity.

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