Magnetic Fronts in Spiral Galaxies

Details Magnetic Fronts in Spiral Galaxies Magnetic Fronts in Spiral Galaxies

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc...92s&link_type=abstract

Plasma Turbulence and Energetic Particles in Astrophysics, Proceedings of the International Conference, Cracow (Poland), 5-10 Se

Astronomy and Astrophysics

Astrophysics

Scientific paper

We study the nonlinear asymptotic thin disc approximation to the mean field dynamo equations, as applicable to spiral galaxies. The circumstances in which sharp magnetic field structures (fronts) can propagate radially are investigated, and an expression for the speed of propagation derived. We find that the speed of an interior front is proportional to η/R* (where η is the diffusivity and R* the galactic radius), whereas an exterior front moves with speed of order sqrt{γη}, where γ is the local growth rate of the dynamo. Numerical simulations are presented, that agree well with our asymptotic results.

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