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The relation between the intensities of umbra and penumbra of large sunspots

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Abstract

Based on pinhole photometer observations in 4–6 wavelength regions we have searched for a connection between the intensities of the umbra and the penumbra of sunspots. For the 1.67 μm wavelength region it is apparent that spots with dark umbrae also have dark penumbrae. In the other wavelength regions similar relations are found. The darkness of the spot is probably connected with the degree of complexity of the spot.

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References

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Authors and Affiliations

  1. Institute of Theoretical Astrophysics, University of Oslo, Oslo, Norway

    G. Ekmann

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  1. G. Ekmann
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Ekmann, G. The relation between the intensities of umbra and penumbra of large sunspots. Sol Phys 38, 73–75 (1974). https://doi.org/10.1007/BF00161825

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  • DOI: https://doi.org/10.1007/BF00161825

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