Magnetic dynamo action in helical turbulence

Details Magnetic dynamo action in helical turbulence Magnetic dynamo action in helical turbulence

2007-11-06

arxiv.org/abs/0711.0973v2

Astrophys.J.671:L185-L188,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 1 figure (with minor changes to match published version)

Scientific paper

10.1086/525278

We investigate magnetic field amplification in a turbulent velocity field with nonzero helicity, in the framework of the kinematic Kazantsev-Kraichnan model. We present the numerical solution of the model for the practically important case of Kolmogorov distribution of velocity fluctuations, with a large magnetic Reynolds number. We find that in contrast to the nonhelical case where growing magnetic fields are described by a few bound eigenmodes concentrated inside the inertial interval of the velocity field, in the helical case the number of bound eigenmodes considerably increases; moreover, new unbound eigenmodes appear. Both bound and unbound eigenmodes contribute to the large-scale magnetic field. This indicates a limited applicability of the conventional alpha model of a large-scale dynamo action, which captures only unbound modes.

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