A Macroscopic Description of a Generalized Self-Organized Criticality System: Astrophysical Applications

Abstract

We suggest a generalized definition of self-organized criticality (SOC) systems: SOC is a critical state of a nonlinear energy dissipation system that is slowly and continuously driven towards a critical value of a system-wide instability threshold, producing scale-free, fractal-diffusive, and intermittent avalanches with powerlaw-like size distributions. We develop here a macroscopic description of SOC systems that provides an equivalent description of the complex microscopic fine structure, in terms of fractal-diffusive transport (FD-SOC). Quantitative values for the size distributions of SOC parameters (length scales $L$, time scales $T$, waiting times $\Delta t$, fluxes $F$, and energies $E$) are derived from first principles, using the scale-free probability conjecture, $N(L)dL\propto L^{-d}$, for Euclidean space dimension $d$. We apply this model to astrophysical SOC systems, such as lunar craters, the asteroid belt, Saturn ring particles, magnetospheric substorms, radiation belt electrons, solar flares, stellar flares, pulsar glitches, soft gamma-ray repeaters, black-hole objects, blazars, and cosmic rays. The FD-SOC model predicts correctly the size distributions of 8 out of these 12 astrophysical phenomena, and indicates non-standard scaling laws and measurement biases for the others.

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• 25 Years of Self-Organized Criticality: Numerical Detection Methods
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• Statistics of X-ray flares of Sagittarius A*: evidence for solar-like self-organized criticality phenomenon
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• Scale invariance in X-ray flares of gamma-ray bursts
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