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 journalArticle

93 Scopus citations

Abstract

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
Volume100
Issue number18
DOIs
StatePublished - May 6 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Generation of magnetic field by combined action of turbulence and shear'. Together they form a unique fingerprint.

  • Cite this

    Yousef, T. A., Heinemann, T., Schekochihin, A. A., Kleeorin, N., Rogachevskii, I., Iskakov, A. B., Cowley, S. C., & McWilliams, J. C. (2008). Generation of magnetic field by combined action of turbulence and shear. Physical review letters, 100(18), [184501]. https://doi.org/10.1103/PhysRevLett.100.184501