Solar Physics

, Volume 209, Issue 2, pp 311–319 | Cite as

On the Reliability of the de la rue Sunspot Area Measurements

  • J.M. Vaquero
  • F. Sánchez-bajo
  • M.C. Gallego


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.


19th Century Solar Activity Activity Index Area Measurement Sunspot Area 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Carrington, R. C.: 1863, Observations of the Spots on the Sun, London.Google Scholar
  2. De la Rue, W., Stewart, B., and Loewy, B.: 1869, Phil. Trans. 159, 1.CrossRefGoogle Scholar
  3. De la Rue, W., Stewart, B., and Loewy, B.: 1870, Phil. Trans. 160, 389.CrossRefGoogle Scholar
  4. Hoyt, D. V. and Schatten, K. H.: 1998, Solar Phys. 179, 189.ADSCrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • J.M. Vaquero
    • 1
  • F. Sánchez-bajo
    • 2
  • M.C. Gallego
    • 3
  1. 1.Departamento de Física, Escuela PolitécnicaUniversidad de ExtremaduraCáceresSpain
  2. 2.Universidad de ExtremaduraBadajozSpain
  3. 3.Departamento de Física, Facultad de CienciasUniversidad de ExtremaduraBadajozSpain

Personalised recommendations