Well, Color Me Gobsmacked!

Guest Post by Willis Eschenbach I’ve developed a curious kind of algorithm that I’ve humorously called “slow Fourier analysis”, but which might be better described as a method for direct spectral analysis. The basic concept is quite simple. I fit a sine wave with a certain cycle length, say 19 months, to the dataset of…

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The Tip of the Gleissberg

Guest Post by Willis Eschenbach A look at Gleissberg’s famous solar cycle reveals that it is constructed from some dubious signal analysis methods. This purported 80-year “Gleissberg cycle” in the sunspot numbers has excited much interest since Gleissberg’s original work. However, the claimed length of the cycle has varied widely.