Enhancement of Small-scale Turbulent Dynamo by Large-scale Shear
نویسندگان
چکیده
منابع مشابه
Small-Scale Turbulent Dynamo
Kinematic dynamo theory is presented here for turbulent conductive fluids. We describe how inhomogeneous magnetic fluctuations are generated below the viscous scale of turbulence where the spatial smoothness of the velocity permits a systematic analysis of the Lagrangian path dynamics. We find analytically the moments and multipoint correlation functions of the magnetic field at small yet finit...
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We report the results of an extensive numerical study of the small-scale turbulent dynamo. The primary focus is on the case of large magnetic Prandtl numbers Prm, which is relevant for hot low-density astrophysical plasmas. A Prm parameter scan is given for the model case of viscosity-dominated (low-Reynolds-number) turbulence. We concentrate on three topics: magnetic-energy spectra and saturat...
متن کاملThe magnetic shear-current effect: generation of large-scale magnetic fields by the small-scale dynamo
J. Squire1,3† and A. Bhattacharjee2,3 TAPIR, Mailcode 350-17, California Institute of Technology, Pasadena, CA 91125, USA Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ 08543 Max Planck/Princeton Center for Plasma Physics, Department of Astrophysical Sciences and Princeton Plasma Physics Laboratory, Princeton University, Princet...
متن کاملGeneration of Large-Scale Magnetic Fields by Small-Scale Dynamo in Shear Flows.
We propose a new mechanism for a turbulent mean-field dynamo in which the magnetic fluctuations resulting from a small-scale dynamo drive the generation of large-scale magnetic fields. This is in stark contrast to the common idea that small-scale magnetic fields should be harmful to large-scale dynamo action. These dynamos occur in the presence of a large-scale velocity shear and do not require...
متن کاملSmall - scale turbulent dynamo - a numerical investigation
We present the results of a numerical investigation of the turbulent kinematic dynamo problem in a high Prandtl number regime. The scales of the magnetic turbulence we consider are far smaller than the Kolmogorov dissipative scale, so that the magnetic wavepackets evolve in a nearly smooth velocity field. Firstly, we consider the Kraichnan-Kazantsev model (KKM) in which the strain matrix is tak...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2017
ISSN: 2041-8213
DOI: 10.3847/2041-8213/aa96a1