Generation of magnetic field by combined action of turbulence and shear

T. A. Yousef, T. Heinemann, A. A. Schekochihin, N. Kleeorin, I. Rogachevskii, A. B. Iskakov, S. C. Cowley, J. C. McWilliams

Research output: Contribution to journalArticlepeer-review

105 Scopus citations


The feasibility of a mean-field dynamo in nonhelical turbulence with a superimposed linear shear is studied numerically in elongated shearing boxes. Exponential growth of the magnetic field at scales much larger than the outer scale of the turbulence is found. The characteristic scale of the field is lB̄S-1/2 and the growth rate is γS, 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.

Original languageEnglish (US)
Article number184501
JournalPhysical review letters
Issue number18
StatePublished - May 6 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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