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J. A. García  - - - 
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J. M. Vaquero

87 shared publications

Escuela Politécnica, Universidad de Extremadura

M. C. Gallego

21 shared publications

Universidad de Extremadura

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(2006)
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Article 2 Reads 1 Citation A Note on Solar Cycle Length Estimates J. M. Vaquero, J. A. García, M. C. Gallego Published: 01 May 2006
Solar Physics, doi: 10.1007/s11207-006-0102-9
DOI See at publisher website
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Recently, new estimates of the solar cycle length (SCL) have been calculated using the Zurich Sunspot Number (R Z) and the Regression-Fourier-Calculus (RFC)-method, a mathematically rigorous method involving multiple regression, Fourier approximation, and analytical expressions for the first derivative. In this short contribution, we show estimates of the solar cycle length using the RFC-method and the Group Sunspot Number (R G) instead the R Z. Several authors have showed the advantages of R G for the analysis of sunspot activity before 1850. The use of R G solves some doubtful solar cycle length estimates obtained around 1800 using R Z.