Solar Physics

, Volume 221, Issue 1, pp 179–189 | Cite as

Reconstruction of a Monthly Homogeneous Sunspot Area Series Since 1832

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


In this work, a procedure to elaborate a homogeneous sunspot area series using the Royal Greenwich Observatory/USAF/NOAA data (from 1874 to the present) and the De la Rue and co-workers data (from 1832 to 1868) is presented. These two data series correspond to time intervals that do not overlap and a direct comparison between them could not be carried out. We used the International Sunspot Number (R i ) and the Group Sunspot Number (R G ) as a link between the two original series. Thus, two homogeneous sunspot area series have been built using a simple mathematic procedure based on linear relations.


Data Series Linear Relation Sunspot Number Group Sunspot Sunspot Area 
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Copyright information

© Kluwer Academic Publishers 2004

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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