A Note on Solar Cycle Length Estimates |
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| Authors: | J M Vaquero J A García M C Gallego |
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| Institution: | (1) Departamento de Física, Escuela Politécnica, Universidad de Extremadura, Avda de la Universidad s/n, 10071 Cáceres, Spain;(2) Departamento de Física, Facultad de Ciencias, Universidad de Extremadura, Avda de Elvas s/n, 06071 Badajoz, Spain |
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| Abstract: | Recently, new estimates of the solar cycle length (SCL) have been calculated using the Zurich Sunspot Number (RZ) 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 (RG) instead the RZ. Several authors have showed the advantages of RG for the analysis of sunspot activity before 1850. The use of RG solves some doubtful solar cycle length estimates obtained around 1800 using RZ. |
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