Solar Physics

, Volume 218, Issue 1–2, pp 307–317 | Cite as

Periodicities of the de la rue Sunspot Area Measurements

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


In the 19th century De la Rue, Stewart, and Loewy carried out a compilation of drawings and photographs of the solar sunspots corresponding to the interval 1832–1868. Using these drawings and photographs, they determined fortnightly values of the percentage of the solar photosphere covered by the sunspots. In this work, we have performed a spectral analysis of these data in order to determine possible periodic signals. In addition to the 11-year solar cycle, short cycles of about 330 days and 30–50 days have been recovered, lacking the 150–160 days period discovered by other authors using several solar activity indicators.


19th Century Spectral Analysis Solar Activity Solar Cycle Area Measurement 
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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • J.M. Vaquero
    • 1
  • M.C. Gallego
    • 2
  • F. Sánchez-bajo
    • 3
  1. 1.Departamento de Física, Escuela PolitécnicaUniversidad de ExtremaduraCáceresSpain
  2. 2.Departamento de Física, Facultad de CienciasUniversidad de ExtremaduraBadajozSpain
  3. 3.Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías IndustrialesUniversidad de ExtremaduraBadajozSpain

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