Abstract
Simultaneous observations of relative umbral intensities in four wavelength regions are presented. In the visual wavelength region the umbral intensities show lower values than given by most authors. By observing the same spot during different seeing conditions the method of correction for stray light is found to be consistent within the accuracy of the method. In addition, a new simple correction method is suggested.
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References
Brahde, R.: 1967, Institute of Theoretical Astrophysics, Report No. 23.
Hénoux, I. C.: 1968, Ann. Astrophys. 31, 511.
Hénoux, I. C.: 1969, Astron. Astrophys. 2, 288.
Jensen, E.: 1968, Solar Phys. 4, 114.
Kneer, F.: 1972, Astron. Astrophys. 18, 39.
Kneer, F. and Mattig, W.: 1968, Solar Phys. 5, 42.
Maltby, P.: 1970, Solar Phys. 13, 312.
Maltby, P.: 1971, Solar Phys. 18, 3.
Maltby, P.: 1972, Solar Phys. 26, 76.
Maltby, P. and Mykland, N.: 1969, Solar Phys. 8, 23.
Maltby, P. and Staveland, L.: 1971, Solar Phys. 18, 443.
Mattig, W.: 1971, Solar Phys. 18, 434.
Rødberg, H.: 1966, Nature 211, 394.
Rossbach, N. and Schröter, E. H.: 1970, Solar Phys. 12, 95.
Staveland, L.: 1969, Thesis, University of Oslo.
Staveland, L.: 1970, Solar Phys. 12, 328.
Wittmann, A. and Schröter, E. H.: 1969, Solar Phys. 10, 357.
Wöhl, H., Wittmann, A., and Schröter, E. H.: 1970, Solar Phys. 13, 104.
Zwaan, C.: 1965, Rech. Inst. Astron. Utrecht 17 (4).
Zwaan, C.: 1968, Ann. Rev. Astron. Astrophys. 6, 135.
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Mykland, N. Relative umbral intensity of a large sunspot. Sol Phys 28, 49–60 (1973). https://doi.org/10.1007/BF00152911
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DOI: https://doi.org/10.1007/BF00152911