期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.255004
关键词
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资金
- NSF [AST-0807432]
- NASA [NNX08AH24G]
- STFC
- Leverhulme Trust Network for Magnetized Plasma Turbulence
- STFC [ST/F002505/2] Funding Source: UKRI
- NASA [100270, NNX08AH24G] Funding Source: Federal RePORTER
A rigorous theory for the generation of a large-scale magnetic field by random nonhelically forced motions of a conducting fluid combined with a linear shear is presented in the analytically tractable limit of low magnetic Reynolds number (Rm) and weak shear. The dynamo is kinematic and due to fluctuations in the net (volume-averaged) electromotive force. This is a minimal proof-of-concept quasilinear calculation aiming to put the shear dynamo, a new effect recently found in numerical experiments, on a firm theoretical footing. Numerically observed scalings of the wave number and growth rate of the fastest-growing mode, previously not understood, are derived analytically. The simplicity of the model suggests that shear dynamo action may be a generic property of sheared magnetohydrodynamic turbulence.
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