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Turbulent diffusion and galactic magnetism

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arxiv 0910.0072 v1 pith:R7HELHS6 submitted 2009-10-01 astro-ph.GA astro-ph.SR

Axel Brandenburg , Fabio Del Sordo (Nordita) This is my paper · ORCID
classification astro-ph.GAastro-ph.SR
keywords expansiongalacticmagneticturbulenceturbulentwavescontextdiffusion
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Using the test-field method for nearly irrotational turbulence driven by spherical expansion waves it is shown that the turbulent magnetic diffusivity increases with magnetic Reynolds numbers. Its value levels off at several times the rms velocity of the turbulence multiplied by the typical radius of the expansion waves. This result is discussed in the context of the galactic mean-field dynamo.

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