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Turbulent diffusion and galactic magnetism

Published online by Cambridge University Press:  21 October 2010

Axel Brandenburg  and
Fabio Del Sordo
Axel Brandenburg
Affiliation:
NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden; and Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
Fabio Del Sordo
Affiliation:
NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden; and Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
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Abstract

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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.

Keywords

turbulence(magnetohydrodynamics:) MHDgalaxies: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 432 - 433
Copyright
Copyright © International Astronomical Union 2010

References

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