Observations of the intensity of the penumbra of sunspots |
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| Authors: | P Maltby |
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| Institution: | (1) Institute of Theoretical Astrophysics, University of Oslo, Oslo, Norway |
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| Abstract: | Observations of the penumbral intensity of sunspots in 13 wavelength regions are presented. In 4 wavelength regions 54 sunspots are measured. In the other wavelength regions the number of sunspots considered ranges from 3–19.The penumbral intensity alters with position within the spot. This intensity variation is found to be comparable with the change in intensity from one spot to another. The penumbral intensity is found to be independent of spot size in the sample considered.The penumbra model of Kjeldseth Moe and Maltby (1969) with   = 0.055 is supported by the measurements. |
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