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摘要
We investigate the -effect and the turbulent transport of magnetic flux (-effect) by considering a turbulence driven by an isotropic helical forcing in the presence of a background large-scale shear flow. Due to shear flow, the turbulence is highly anisotropic. The effect of this shear-induced anisotropy on the structure of the electromotive force is computed self-consistently. We show that for weak shear, magnetic pumping (-effect) appears, and the -effect becomes highly anisotropic: the component of the -effect in the direction of the shear is smaller than the one in the direction perpendicular to the shear with non-vanishing non-diagonal components. However, a sufficiently strong shear leads to severe quenching of the - and -effects due to shear stabilisation.
- 出版日期2010
