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On the Reliability of the de la rue Sunspot Area Measurements

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Abstract

In the 19th century De la Rue, Stewart, and Loewy carried out a compilation of drawings and photographs of the solar sunspots in the period 1832–1868. From these drawings and photographs, they determined fortnightly values of the sunspot areas. In this work, monthly values of the sunspot areas for the period 1832–1868 are calculated and the reliability of these data in terms of the solar activity indices is discussed.

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References

  • Carrington, R. C.: 1863, Observations of the Spots on the Sun, London.

  • De la Rue, W., Stewart, B., and Loewy, B.: 1869, Phil. Trans. 159, 1.

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  • De la Rue, W., Stewart, B., and Loewy, B.: 1870, Phil. Trans. 160, 389.

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  • Hoyt, D. V. and Schatten, K. H.: 1998, Solar Phys. 179, 189.

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Authors and Affiliations

  1. Departamento de Física, Escuela Politécnica, Universidad de Extremadura, Avda. de la Universidad s/n, 10071, Cáceres, Spain

    J.M. Vaquero

  2. Universidad de Extremadura, Ctra de Elvas s/n, 06071, Badajoz, Spain

    F. Sánchez-bajo

  3. Departamento de Física, Facultad de Ciencias, Universidad de Extremadura, Ctra de Elvas s/n, 06071, Badajoz, Spain

    M.C. Gallego

Authors
  1. J.M. Vaquero
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  2. F. Sánchez-bajo
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  3. M.C. Gallego
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Vaquero, J., Sánchez-bajo, F. & Gallego, M. On the Reliability of the de la rue Sunspot Area Measurements. Solar Physics 209, 311–319 (2002). https://doi.org/10.1023/A:1021278520427

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  • DOI: https://doi.org/10.1023/A:1021278520427

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