Solar Physics

, Volume 165, Issue 1, pp 181–192 | Cite as

How well was the Sun observed during the Maunder Minimum?

  • Douglas V. Hoyt
  • Kenneth H. Schatten
Article

Abstract

In this paper we examine how well the Sun and sunspots were observed during the Maunder Minimum from 1645 to 1715. Recent research has given us the dates of observations by Hevelius, Picard, La Hire, Flamsteed, and about 70 other observers. These specific observations allow a ‘lower estimate’ of the fraction of the time the Sun was observed to be deduced. It is found that 52.7% of the days have recorded observations. There are additional 12 observers who provide general statements that no sunspots were observed during specific years or intervals despite diligent efforts. Taking these statements to mean, unrealistically, that every day during these intervals was observed, gives an ‘upper estimate’ of 98% of the days. If the general statements are relaxed by assuming that 100 ± 50 days per year were actually observed by these diligent observers, than our ‘best estimate’ is that 68%±7% of the days during the Maunder Minimum were observed. In short, this supports the view that the Maunder Minimum existed and was not an artifact of few observations. Some sunspots are probably still missed in modern compilations, but the existence of a prolonged sunspot minimum would not be threatened by their discovery in future research. Additional support for intense scrutiny of the Sun comes from a report of a white-light flare in 1705 and from the numerous reports of new sunspots entering the disk of the Sun.

Keywords

Flare General Statement Lower Estimate Numerous Report Maunder Minimum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Anonymous: 1860, Popular Science Monthly 1, 158.Google Scholar
  2. Bigourdan, G.: 1928, Comptes Rend. Hebd. Academie des Sciences, Paris 187, 185.Google Scholar
  3. Clerke, A. M.: 1894, Knowledge 17, 206.Google Scholar
  4. Clough, H. W.: 1905, Astrophys. J. 22, 42.Google Scholar
  5. Eddy, J. A.: 1976, Science 192, 1189.Google Scholar
  6. Eddy, J. A.: 1983, Solar Phys. 89, 195.Google Scholar
  7. Hogg, H. S.: 1946, Roy. Astron. Soc. Canada 40, 373.Google Scholar
  8. Hoyt, D. V. and Schatten, K. H.: 1995a, Solar Phys. 160, 371.Google Scholar
  9. Hoyt, D. V. and Schatten, K. H.: 1995b, Solar Phys. 160, 379.Google Scholar
  10. Luby, W. A.: 1942, Pop. Astron. 50, 537.Google Scholar
  11. Maunder, A. S. D. and Maunder, E. W.: 1908, The Heavens and Their Story, R. Culley, London, 357 pp.Google Scholar
  12. Maunder, E. W.: 1894, Knowledge 17, 173.Google Scholar
  13. Maunder, E. W.: 1922, J. Brit. Astron. Assoc. 32, 140.Google Scholar
  14. Newton, H. W. and Leigh-Smith, P.: 1941, J. Brit. Astron. Assoc. 51, 101.Google Scholar
  15. Nicholson, S. B.: 1933, Astronomical Society of the Pacific, Leaflet 50.Google Scholar
  16. Ribes, J. C. and Nesmes-Ribes, E.: 1993, Astron. Astrophys. 276, 549.Google Scholar
  17. Schuster, A.: 1906, Phil. Trans. Roy. Soc. London 206, 69.Google Scholar
  18. Spoerer, G.: 1889, Nova Acta der Ksl. Leop.-Carol. Deutschen Akademie der Naturforscher 53, 283.Google Scholar
  19. Wolf, R.: 1860,‘Sunspot Observations, 1610–1715’, unpublished manuscript, G. E. Hale Library, Hale Observatory, Pasadena, California, ca.1860.Google Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Douglas V. Hoyt
    • 1
  • Kenneth H. Schatten
    • 2
  1. 1.LaurelU.S.A.
  2. 2.NASA/Goddard Space Flight Center, Code 926GreenbeltU.S.A.

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