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      Scaling of spectral anisotropy with magnetic field strength in decaying magnetohydrodynamic turbulence

      Oughton, Sean; Matthaeus, William H.; Ghosh, Sanjoy
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      Scaling of spectral anisotropy.pdf
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      DOI
       10.1063/1.873159
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      Oughton, S., Matthaeus, W. H., & Ghosh, S. (2004). Scaling of spectral anisotropy with magnetic field strength in decaying magnetohydrodynamic turbulence. Physics of Plasmas, 5(12), 4235.
      Permanent Research Commons link: https://hdl.handle.net/10289/8592
      Abstract
      Space plasmameasurements,laboratory experiments, and simulations have shown that magnetohydrodynamic(MHD)turbulence exhibits a dynamical tendency towards spectral anisotropy given a sufficiently strong background magnetic field. Here the undriven decaying initial-value problem for homogeneous MHDturbulence is examined with the purpose of characterizing the variation of spectral anisotropy of the turbulent fluctuations with magnetic field strength. Numerical results for both incompressible and compressible MHD are presented. A simple model for the scaling of this spectral anisotropy as a function of the fluctuating magnetic field over total magnetic field is offered. The arguments are based on ideas from reduced MHD (RMHD) dynamics and resonant driving of certain non-RMHD modes. The results suggest physical bases for explaining variations of the anisotropy with compressibility, Reynolds numbers, and spectral width of the (isotropic) initial conditions.
      Date
      1998
      Type
      Journal Article
      Publisher
      AMER INST PHYSICS
      Rights
      © 1998 American Institute of Physics
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      • Computing and Mathematical Sciences Papers [1455]
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