Generation of Magnetic Field by Combined Action of Turbulence and Shear

Details Generation of Magnetic Field by Combined Action of Turbulence and Shear Generation of Magnetic Field by Combined Action of Turbulence and Shear

2007-10-17

arxiv.org/abs/0710.3359v2

Phys.Rev.Lett.100:184501,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures; replaced with revised version that matches the published PRL

Scientific paper

10.1103/PhysRevLett.100.184501

The feasibility of a mean-field dynamo in nonhelical turbulence with superimposed linear shear is studied numerically in elongated shearing boxes. Exponential growth of magnetic field at scales much larger than the outer scale of the turbulence is found. The charateristic scale of the field is l_B ~ S^{-1/2} and growth rate is gamma ~ S, where S is the shearing rate. This newly discovered shear dynamo effect potentially represents a very generic mechanism for generating large-scale magnetic fields in a broad class of astrophysical systems with spatially coherent mean flows.

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