Kinematic alpha effect in isotropic turbulence simulations

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dc.creatorSur, Sharanya
dc.creatorBrandenburg, Axel
dc.creatorSubramanian, Kandaswamy
dc.date2007-11-23
dc.date.accessioned2026-07-07T09:25:28Z
dc.date.available2026-07-07T09:25:28Z
dc.descriptionUsing numerical simulations at moderate magnetic Reynolds numbers up to 220 it is shown that in the kinematic regime, isotropic helical turbulence leads to an alpha 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 $\Rm$, alpha and turbulent diffusivity are proportional to $\Rm$. Over finite time intervals meaningful values of alpha and turbulent diffusivity can be obtained even when there is small-scale dynamo action that produces strong magnetic fluctuations. This suggests that small-scale dynamo-generated fields do not make a correlated contribution to the mean electromotive force.
dc.descriptionAccepted for publication in MNRAS Letters
dc.identifierhttps://arxiv.org/abs/0711.3789
dc.identifierhttp://arxiv.org/abs/0711.3789
dc.identifierMonthly Notices Roy. Astron. Soc. 385, L15-L19 (2008)
dc.identifierdoi:10.1111/j.1745-3933.2008.00423.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/156415
dc.subjectAstrophysics
dc.titleKinematic alpha effect in isotropic turbulence simulations
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