The Effect of Gleissberg's "Secular Smoothing"

Guest Post by Willis Eschenbach ABSTRACT: Slow Fourier Transform (SFT) periodograms reveal the strength of the cycles in the full sunspot dataset (n=314), in the sunspot cycle maxima data alone…

The Slow Fourier Transform (SFT)

Guest Post by Willis Eschenbach While investigating the question of cycles in climate datasets (Part 1, Part 2), I invented a method I called “sinusoidal periodicity”. What I did was…