Flicker noises in astronomy and elsewhere.
Abstract
Timescale variation from astronomical sources has long been referred to as a 'signal'. In other words, the variation exhibits some form of regularity. In this paper, it is maintained that the stochastic property of timescale variation is also common to a wide variety of physical phenomena. Hence, integration and Fourier transformation of noise functions, say, random white noise, can impart to the noise a semblance of regularity, turning the noise into a 'signal'. Attention is given to flicker noise (or lowfrequency noises in general), and their appearance in largely nonastronomical physical phenomena. Electrical and seismic noise are presented as examples. Integrated and plotted onto a log scale, random noise shows a remarkable fit with the power law. Finally, the generation of flicker noise is dealt with mathematically by superimposition and causal filtering.
 Publication:

Comments on Astrophysics
 Pub Date:
 1978
 Bibcode:
 1978ComAp...7..103P
 Keywords:

 Flicker;
 Noise Spectra;
 Power Spectra;
 Radio Astronomy;
 Very Low Frequencies;
 Fourier Transformation;
 Radio Sources (Astronomy);
 Random Noise;
 Random Walk;
 Signal Analysis;
 Signal To Noise Ratios;
 White Noise;
 Astronomy;
 Theoretical Astrophysics;
 Gravitational Instability;
 Neutrino Astronomy;
 Infrared Astronomy;
 XRay Astronomy;
 GammaRay Astronomy;
 Element Abundances;
 Elements:Origin