Turbulent Dynamos and Magnetic Helicity

Details Turbulent Dynamos and Magnetic Helicity Turbulent Dynamos and Magnetic Helicity

2001-02-19

arxiv.org/abs/astro-ph/0102321v1

Phys.Rev.Lett.83:3198-3201,1999

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.83.3198

It is shown that the turbulent dynamo $\alpha$-effect converts magnetic helicity from the turbulent field to the mean field when the turbulence is electromagnetic while the magnetic helicity of the mean-field is transported across space when the turbulence is electrostatic or due to the electron diamagnetic effect. In all cases, however, the dynamo effect strictly conserves the total helicity except for resistive effects and a small battery effect. Implications for astrophysical situations, especially for the solar dynamo, are discussed.

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