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

doi:10.1103/PhysRevLett.100.184501

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 journal › Article › peer-review

105 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 language	English (US)
Article number	184501
Journal	Physical review letters
Volume	100
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.100.184501
State	Published - May 6 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.100.184501

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title = "Generation of magnetic field by combined action of turbulence and shear",

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 l{\=B}S-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.",

author = "Yousef, {T. A.} and T. Heinemann and Schekochihin, {A. A.} and N. Kleeorin and I. Rogachevskii and Iskakov, {A. B.} and Cowley, {S. C.} and McWilliams, {J. C.}",

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doi = "10.1103/PhysRevLett.100.184501",

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T1 - Generation of magnetic field by combined action of turbulence and shear

AU - Yousef, T. A.

AU - Heinemann, T.

AU - Schekochihin, A. A.

AU - Kleeorin, N.

AU - Rogachevskii, I.

AU - Iskakov, A. B.

AU - Cowley, S. C.

AU - McWilliams, J. C.

PY - 2008/5/6

Y1 - 2008/5/6

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.100.184501

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JO - Physical review letters

JF - Physical review letters

IS - 18

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ER -

Generation of magnetic field by combined action of turbulence and shear

Abstract

All Science Journal Classification (ASJC) codes

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