Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..235..433v&link_type=abstract
Solar Physics, Volume 235, Issue 1-2, pp. 433-437
Physics
4
Scientific paper
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.
Gallego M. C.
García Alejandro J.
Vaquero José M.
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