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Solar Physics

, Volume 5, Issue 1, pp 42–49 | Cite as

Sunspot intensities and their correction for scattered light

  • F. Kneer
  • W. Mattig
Article

Abstract

Photoelectric measurements of monochromatic spot intensities obtained with the domeless Coudé refractor in Anacapri are given. The scattered light superimposed on the spot, as deduced from measurements outside the sun's limb, amounts on the average to about 4% of the photospheric intensity. The accuracy of the derived spot intensities is better than 10%. Two of four investigated spots yielded temperatures below 3900K (ΔΘ > 0.5).

Keywords

Scattered Light Spot Intensity Sunspot Intensity Photoelectric Measurement Photospheric Intensity 

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References

  1. Birkle, K. and Mattig, W.: 1965, Z. Astrophys. 60, 264.ADSGoogle Scholar
  2. David, K. H. and Elste, G.: 1962, Z. Astrophys. 54, 12.ADSGoogle Scholar
  3. Deubner, F. L.: 1966, in The Fine Structure of the Solar Atmosphere, Proceedings of Capri Colloquium, p. 26.Google Scholar
  4. Fricke, K. and Elsässer, H.: 1965, Z. Astrophys. 63, 35.ADSGoogle Scholar
  5. Zwaan, C: 1965, Rech. Inst. Astron. Utrecht 17, (4).Google Scholar

Copyright information

© D. Reidel Publishing Company 1968

Authors and Affiliations

  • F. Kneer
    • 1
  • W. Mattig
    • 1
  1. 1.Fraunhofer-InstitutFreiburgGermany

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