On the center-to-limb variation of sunspot brightness |
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Authors: | W. Mattig |
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Affiliation: | (1) Fraunhofer Institute, Freiburg i. Br., Germany |
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Abstract: | A preliminary analysis of recent measurements of the brightness ratio spot-photosphere of various authors leads to the result, that the limb-darkening of the umbra is considerably less than that of the photosphere. The small value of the center-to-limb variation implies a very small temperature gradient, which is, for optical depths >0.2, about one order of magnitude smaller than previously thought (Figure 3). This result would seem to rule out radiative equilibrium in the deeper layers (S>0.2) of sunspot umbrae.Mitteilung aus dem Fraunhofer Institut Nr. 83. |
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