A quantitative study of Ca II network geometry |
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| Authors: | Nirupama Raghavan |
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| Institution: | 1. Nehru Planetarium, Jawaharlal Nehru Memorial Fund, 110 011, New Delhi, India
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| Abstract: | 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 N A, 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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