Nonlinear Sciences – Adaptation and Self-Organizing Systems
Scientific paper
2004-03-16
Fractals 12:405,2004
Nonlinear Sciences
Adaptation and Self-Organizing Systems
To appear in "Fractals"
Scientific paper
10.1142/S0218348X0400=
Monthly averages of the sunspot number visible on the sun, observed from 1749, Zurich Observatory, and from 1848 other observatories, have been analyzed. This time signal presents a frequency power spectra with a clear $1/f^\alpha$ behavior with $\alpha\simeq 0.8 \pm 0.2$. The well known cycle of approximately 11 years, clearly present in the spectrum, does not produce a sensible distortion of that behavior. The eventual characterization of the sunspot time series as a fractal is analyzed by means of the detrended fluctuation analysis. The jump size distribution of the signal is also studied.
Fanchiotti Huner
Garcia Canal Carlos A.
Hojvat Carlos
Sciutto Sergio J.
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