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Title:
Kinematic α-effect in isotropic turbulence simulations
Authors:
Sur, Sharanya; Brandenburg, Axel; Subramanian, Kandaswamy
Affiliation:
AA(Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, India), AB(NORDITA, AlbaNova University Centre, SE - 106 91 Stockholm, Sweden), AC(Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007, India)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 385, Issue 1, pp. L15-L19. (MNRAS Homepage)
Publication Date:
03/2008
Origin:
MNRAS
Astronomy Keywords:
hydrodynamics, magnetic fields, MHD, turbulence
DOI:
10.1111/j.1745-3933.2008.00423.x
Bibliographic Code:
2008MNRAS.385L..15S

Abstract

Using numerical simulations at moderate magnetic Reynolds numbers up to 220, it is shown that in the kinematic regime, isotropic helical turbulence leads to an α-effect and a turbulent diffusivity whose values are independent of the magnetic Reynolds number, Rm, provided Rm exceeds unity. These turbulent coefficients are also consistent with expectations from the first-order smoothing approximation. For small values of Rm, α and turbulent diffusivity are proportional to Rm. Over finite time-intervals, meaningful values of α and turbulent diffusivity can be obtained even when there is small-scale dynamo action that produces strong magnetic fluctuations. This suggests that the fields generated by the small-scale dynamo do not make a correlated contribution to the mean electromotive force.

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