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

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

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phya..380..226f&link_type=abstract

Physica A, Volume 380, p. 226-234.

Physics

Scientific paper

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.

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