Large-scale Dynamo Action Driven by Velocity Shear and Rotating Convection

Details Large-scale Dynamo Action Driven by Velocity Shear and Rotating Convection Large-scale Dynamo Action Driven by Velocity Shear and Rotating Convection

2008-10-09

arxiv.org/abs/0810.1586v1

Phys. Rev. Lett. 102, 044501 (2009)

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figs

Scientific paper

10.1103/PhysRevLett.102.044501

By incorporating a large-scale shear flow into turbulent rotating convection, we show that a sufficiently strong shear can promote dynamo action in flows that in the absence of shear do not act as dynamos. Our results are consistent with a dynamo driven by either the shear-current effect or by the interaction between a fluctuating $\alpha$-effect and the velocity shear; they are though inconsistent with either a classical $\alpha^2$ or $\alpha \omega$ mean field dynamo.

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