Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence

Squire, J.; Bhattacharjee, A.

doi:10.1103/PhysRevE.92.053101

Title: Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence

Journal Article · Mon Nov 02 00:00:00 EST 2015 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

DOI:https://doi.org/10.1103/PhysRevE.92.053101· OSTI ID:1256591

Squire, J. ^[1]; Bhattacharjee, A. ^[1]

Princeton Univ., Princeton, NJ (United States)

Here, this article presents a calculation of the mean electromotive force arising from general small-scale magnetohydrodynamical turbulence, within the framework of the second-order correlation approximation. With the goal of improving understanding of the accretion disk dynamo, effects arising through small-scale magnetic fluctuations, velocity gradients, density and turbulence stratification, and rotation, are included. The primary result, which supplements numerical findings, is that an off-diagonal turbulent resistivity due to magnetic fluctuations can produce large-scale dynamo action-the magnetic analog of the "shear-current" effect. In addition, consideration of alpha effects in the stratified regions of disks gives the puzzling result that there is no strong prediction for a sign of alpha, since the effects due to kinetic and magnetic fluctuations, as well as those due to shear and rotation, are each of opposing signs and tend to cancel each other.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; AC02-09-CH11466

OSTI ID:: 1256591

Alternate ID(s):: OSTI ID: 1224869

Report Number(s):: PPPL-5183; PLEEE8

Journal Information:: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, Vol. 92, Issue 5; ISSN 1539-3755

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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