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- W2022842484 abstract "The nonlinear theory of a ``shear-current'' effect in a nonrotating and nonhelical homogeneous turbulence with an imposed mean velocity shear is developed. The shear-current effect is associated with the $overline{mathbf{W}}ifmmodetimeselsetexttimesfi{}overline{mathbf{J}}$ term in the mean electromotive force and causes the generation of the mean magnetic field even in a nonrotating and nonhelical homogeneous turbulence (where $overline{mathbf{W}}$ is the mean vorticity and $overline{mathbf{J}}$ is the mean electric current). It is found that there is no quenching of the nonlinear shear-current effect contrary to the quenching of the nonlinear $ensuremath{alpha}$ effect, the nonlinear turbulent magnetic diffusion, etc. During the nonlinear growth of the mean magnetic field, the shear-current effect only changes its sign at some value ${overline{mathbf{B}}}_{*}$ of the mean magnetic field. The magnitude ${overline{mathbf{B}}}_{*}$ determines the level of the saturated mean magnetic field which is less than the equipartition field. It is shown that the background magnetic fluctuations due to the small-scale dynamo enhance the shear-current effect and reduce the magnitude ${overline{mathbf{B}}}_{*}$. When the level of the background magnetic fluctuations is larger than $1∕3$ of the kinetic energy of the turbulence, the mean magnetic field can be generated due to the shear-current effect for an arbitrary exponent of the energy spectrum of the velocity fluctuations." @default.
- W2022842484 created "2016-06-24" @default.
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- W2022842484 date "2004-10-29" @default.
- W2022842484 modified "2023-10-18" @default.
- W2022842484 title "Nonlinear theory of a “shear-current” effect and mean-field magnetic dynamos" @default.
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- W2022842484 doi "https://doi.org/10.1103/physreve.70.046310" @default.
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