Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvl.107y5004h&link_type=abstract
Physical Review Letters, vol. 107, Issue 25, id. 255004
Physics
7
Plasma Dynamos, Boundary-Free Shear Flow Turbulence, Magnetohydrodynamics, Magnetohydrodynamics And Plasmas
Scientific paper
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.
Heinemann Tobias
McWilliams James C.
Schekochihin Alexander A.
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