Sheared helical turbulence and the helicity constraint in large-scale dynamos

Details Sheared helical turbulence and the helicity constraint in large-scale dynamos Sheared helical turbulence and the helicity constraint in large-scale dynamos

2000-12-11

arxiv.org/abs/astro-ph/0012240v1

P.Chossat et al.(eds.), Dynamo and Dynamics, a Mathematical Challenge, 117-124, 2001. Kluver Ac. Pub.

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures. To be published in the Proceedings of the NATO Advanced Research Workshop, 'Dynamos and Dynamics: a mathem

Scientific paper

The effect of shear on the growth of large scale magnetic fields in helical turbulence is investigated. The resulting large-scale magnetic field is also helical and continues to evolve, after saturation of the small scale field, on a slow resistive time scale. This is a consequence of magnetic helicity conservation. Because of shear, the time scale needed to reach an equipartition-strength large scale field is shortened proportionally to the ratio of the resulting toroidal to poloidal large scale fields.

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