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 α Ω -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.
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