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Title: Dynamic Alignment in Driven Magnetohydrodynamic Turbulence

Abstract

Motivated by recent analytic predictions, we report numerical evidence showing that in driven incompressible magnetohydrodynamic turbulence the magnetic- and velocity-field fluctuations locally tend to align the directions of their polarizations. This dynamic alignment is stronger at smaller scales with the angular mismatch between the polarizations decreasing with the scale {lambda} approximately as {theta}{sub {lambda}}{proportional_to}{lambda}{sup 1/4}. This can naturally lead to a weakening of the nonlinear interactions and provide an explanation for the energy spectrum E(k){proportional_to}k{sup -3/2} that is observed in numerical experiments of strongly magnetized turbulence.

Authors:
;  [1];  [2]
  1. Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637 (United States)
  2. Department of Physics, University of Wisconsin at Madison, 1150 University Avenue, Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
20861528
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 25; Other Information: DOI: 10.1103/PhysRevLett.97.255002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ENERGY SPECTRA; FLUCTUATIONS; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; POLARIZATION; TURBULENCE

Citation Formats

Mason, Joanne, Cattaneo, Fausto, and Boldyrev, Stanislav. Dynamic Alignment in Driven Magnetohydrodynamic Turbulence. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.255002.
Mason, Joanne, Cattaneo, Fausto, & Boldyrev, Stanislav. Dynamic Alignment in Driven Magnetohydrodynamic Turbulence. United States. doi:10.1103/PHYSREVLETT.97.255002.
Mason, Joanne, Cattaneo, Fausto, and Boldyrev, Stanislav. Fri . "Dynamic Alignment in Driven Magnetohydrodynamic Turbulence". United States. doi:10.1103/PHYSREVLETT.97.255002.
@article{osti_20861528,
title = {Dynamic Alignment in Driven Magnetohydrodynamic Turbulence},
author = {Mason, Joanne and Cattaneo, Fausto and Boldyrev, Stanislav},
abstractNote = {Motivated by recent analytic predictions, we report numerical evidence showing that in driven incompressible magnetohydrodynamic turbulence the magnetic- and velocity-field fluctuations locally tend to align the directions of their polarizations. This dynamic alignment is stronger at smaller scales with the angular mismatch between the polarizations decreasing with the scale {lambda} approximately as {theta}{sub {lambda}}{proportional_to}{lambda}{sup 1/4}. This can naturally lead to a weakening of the nonlinear interactions and provide an explanation for the energy spectrum E(k){proportional_to}k{sup -3/2} that is observed in numerical experiments of strongly magnetized turbulence.},
doi = {10.1103/PHYSREVLETT.97.255002},
journal = {Physical Review Letters},
number = 25,
volume = 97,
place = {United States},
year = {Fri Dec 22 00:00:00 EST 2006},
month = {Fri Dec 22 00:00:00 EST 2006}
}