1/f noise as a nonstationary process: Experimental evidence and some analytical conditions

Abstract
Evidence is presented to support the hypothesis that physical systems in thermodynamic nonequilibrium possess, among other fluctuation phenomena, nonstationary noise with a true 1/fα‐power spectral density over all frequencies, and that such spectra are stable. Some consequences of this hypothesis are derived, and a class of time‐dependent autocorrelation functions for such a process is proposed.

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