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Solar cycle variation of sunspot intensity

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Abstract

Broad band pinhole photometer intensity observations of 15 large sunspots covering the spectral region 0.387–2.35 μm are presented. The data are based on measurements on approximately 500 days during the period June, 1967 to December, 1979.

We have found real and significant intensity differences between large sunspots. These differences may be explained by a systematic variation in the umbral temperature throughout the solar cycle. A connection between umbra intensity and heliographic latitude is discussed.

No center-limb variation in the umbra/photosphere intensity ratio is detected. We have searched for possible connections between umbra intensity and a number of other sunspot parameters, like the spot size, without detecting any significant correlation. We conclude that the umbra/photosphere intensity ratio seems to be a unique function of epoch for large sunspots.

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References

  • Albregtsen, F.: 1976, Inst. of Theoretical Astrophys., Int. Report No. 6.

  • Albregtsen, F.: 1978, Thesis, University of Oslo.

  • Albregtsen, F.: 1979, Inst. of Theoretical Astrophys., Report No. 51.

  • Albregtsen, F. and Maltby, P.: 1978, Nature 274, 41.

    Google Scholar 

  • Alfvén, H.: 1943, Arkiv Mat. Astron. Fysik 29, ppNo. 11.

    Google Scholar 

  • Andersen, B. N., Engvold, O., and Pettersen, B. R.: 1977, Inst. of Theoretical Astrophysics, Report No. 50.

  • Brahde, R.: 1974, Inst. of Theoretical Astrophys., Report No. 41.

  • Bray, R. J. and Loughhead, R. E.: 1964, Sunspots, Chapman and Hall, London.

    Google Scholar 

  • Bumba, V. and Suda, J.: 1980, Bull. Astron. Inst. Czech. 31, 101.

    Google Scholar 

  • Cowling, T. G.: 1957, Magnetohydrodynamics, Interscience Publ., New York.

    Google Scholar 

  • Dicke, R. H.: 1970, Astrophys. J. 159, 25.

    Google Scholar 

  • Edwards, A. W. F.: 1957, Observatory 77, 69.

    Google Scholar 

  • Ekmann, G.: 1974, Solar Phys. 38, 73.

    Google Scholar 

  • Ekmann, G. and Maltby, P.: 1974, Solar Phys. 35, 317.

    Google Scholar 

  • Engvold, O.: 1973, Astron. Astrophys. Suppl. 10, 11.

    Google Scholar 

  • Eriksen, G. and Maltby, P.: 1973, Proceedings of the First Europ. Astron. Meeting, Vol. 1, 87.

    Google Scholar 

  • Gaur, V. P., Pande, M. C., and Sah, M.: 1979, Solar Phys. 62, 83.

    Google Scholar 

  • Hald, A.: 1952, Statistical Theory with Engineering Applications, John Wiley & Sons, New York.

    Google Scholar 

  • Hall, D. N. B.: 1973, An Atlas of Infrared Spectra of the Solar Photosphere and of Sunspot Umbrae, in the Spectral Intervals, 4040 cm−1 -5095 cm−1, 5550 cm−1 -6700 cm−1, 7400 cm−1 -8790 cm−1, Kitt Peak National Observatory.

  • Hansen, T. L.: 1973, Solar Phys. 32, 505.

    Google Scholar 

  • Hénoux, J.-C.: 1968, Ann. Astrophys. 31, 511.

    Google Scholar 

  • Iuell, P. and Staveland, L.: 1975, Inst. of Theoretical Astrophys., Report No. 43.

  • Jensen, E., Nordø, J., and Ringnes, T. S.: 1955, Astrophys. Norv. 5, 167.

    Google Scholar 

  • Kjeldseth Moe, O. and Maltby, P.: 1974, Solar Phys. 36, 109.

    Google Scholar 

  • Loughhead, R. E., Bray, R. J., and Tappere, E. J.: 1979, Astron. Astrophys. 79, 128.

    Google Scholar 

  • Maltby, P.: 1970, Solar Phys. 13, 312.

    Google Scholar 

  • Maltby, P.: 1977, Solar Phys. 55, 335.

    Google Scholar 

  • Maltby, P. and Albregtsen, F.: 1979, Astrophys. J. 234, L147.

    Google Scholar 

  • Maltby, P. and Mykland, N.: 1969, Solar Phys. 8, 23.

    Google Scholar 

  • Markov, M. N., Volyno, B. V., Zholobov, V. M., Gorbatko, V. V., Glazkov, Ju. N., Petrov, V. S., Ivanov, Ju. S., and Dombrovsky, N. O.: 1979, Nature 281, 463.

    Google Scholar 

  • Moffatt, H. K.: 1978, Magnetic Field Generation in Electrically Conducting Fluids, Cambridge Univ. Press, Cambridge.

    Google Scholar 

  • Mykland, N.: 1973, Solar Phys. 28, 49.

    Google Scholar 

  • Parker, E. N.: 1979a, Astrophys. J. 230, 905.

    Google Scholar 

  • Parker, E. N.: 1979b, Cosmical Magnetic Fields, Clarendon, Oxford.

    Google Scholar 

  • Schmidt, H. U.: 1978, in G. Godoli, G. Noci, and A. Righini (eds.) Future Solar Optical Observations, Needs and Constraints. Osservatorio Astrofisico di Arcetri, No. 106, p. 182.

  • Schmidt, H. U.: 1979, Mitteilungen aus dem Kiepenheuer-Institut, No. 179, p. 95.

  • Schüssler: 1980, Nature 288, 150.

    Google Scholar 

  • Siegel, S.: 1956, Nonparametric Statistics, McGraw-Hill Book Comp., New York.

    Google Scholar 

  • Simon, G. W.: 1966, Astron. J. 71, 190.

    Google Scholar 

  • Soln. Dannye Byull.: 1968–1979.

  • Staveland, L.: 1972, Inst. of Theoretical Astrophys., Report No. 36.

  • Stellmacher, G. and Wiehr, E.: 1972, Astron. Astrophys. 19, 293.

    Google Scholar 

  • Stellmacher, G. and Wiehr, E.: 1975, Astron. Astrophys. 45, 69.

    Google Scholar 

  • Stix, M.: 1979, Mitteilungen aus dem Kiepenheuer-Institut, No. 179, p. 87.

  • Turon, P. J. and Léna, P. J.: 1970, Solar Phys. 14, 112.

    Google Scholar 

  • Zwaan, C.: 1965, Rech. Inst. Astron. Utrecht 17, Part 4.

  • Zwaan, C.: 1974, Solar Phys. 37, 99.

    Google Scholar 

  • Zwaan, C.: 1975, Solar Phys. 45, 115.

    Google Scholar 

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Authors and Affiliations

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

    F. Albregtsen & P. Maltby

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  1. F. Albregtsen
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  2. P. Maltby
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Albregtsen, F., Maltby, P. Solar cycle variation of sunspot intensity. Sol Phys 71, 269–283 (1981). https://doi.org/10.1007/BF00167551

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  • DOI: https://doi.org/10.1007/BF00167551

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