Waves in a two-component model of galactic dynamo: Metastability and stochastic generation

Sergei Fedotov and Andrei Zubarev

Physica A: Statistical Mechanics and its Applications, 2007, vol. 380, issue C, 226-234

Abstract: This paper is concerned with the stochastic generation of a large-scale galactic magnetic field and propagation of magnetic fronts in the subcritical regime. Starting with a two-component thin-disk αΩ-dynamo model in the axisymmetric case, we derive the equation for order parameter in the form of a stochastic reaction–diffusion equation with free energy functional. This equation describes subcritical generation of galactic magnetic field as a first-order phase transition in spatially extended system. We consider in particular a situation in which the magnetic field propagates as a plane front. We derive an approximate formula for propagation speed.

Keywords: Waves; Galactic dynamo; Metastability (search for similar items in EconPapers)
Date: 2007
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:380:y:2007:i:c:p:226-234

DOI: 10.1016/j.physa.2007.02.112

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