Coherent nonhelical shear dynamos driven by magnetic fluctuations at low Reynolds numbers

Squire, J.; Bhattacharjee, A.

doi:10.1088/0004-637x/813/1/52

Coherent nonhelical shear dynamos driven by magnetic fluctuations at low Reynolds numbers

Journal Article · Wed Oct 28 00:00:00 EDT 2015 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637x/813/1/52· OSTI ID:1254733

Squire, J. ^[1]; Bhattacharjee, A. ^[2]

Princeton Univ., Princeton, NJ (United States); California Institute of Technology, Pasadena, CA (United States)
Princeton Univ., Princeton, NJ (United States)

Nonhelical shear dynamos are studied with a particular focus on the possibility of coherent dynamo action. The primary results—serving as a follow up to the results of Squire & Bhattacharjee—pertain to the "magnetic shear-current effect" as a viable mechanism to drive large-scale magnetic field generation. This effect raises the interesting possibility that the saturated state of the small-scale dynamo could drive large-scale dynamo action, and is likely to be important in the unstratified regions of accretion disk turbulence. In this paper, the effect is studied at low Reynolds numbers, removing the complications of small-scale dynamo excitation and aiding analysis by enabling the use of quasi-linear statistical simulation methods. In addition to the magnetically driven dynamo, new results on the kinematic nonhelical shear dynamo are presented. Furthermore, these illustrate the relationship between coherent and incoherent driving in such dynamos, demonstrating the importance of rotation in determining the relative dominance of each mechanism.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Contributing Organization:: Max Planck/Princeton Center for Plasma Physics, Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543, USA; TAPIR, California Institute of Technology, Mailcode 350-17, Pasadena, CA 91125, USA

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1254733

Alternate ID(s):: OSTI ID: 22518723

Report Number(s):: PPPL--5154

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 813; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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