Scale-Locality of Magnetohydrodynamic Turbulence

Details Scale-Locality of Magnetohydrodynamic Turbulence Scale-Locality of Magnetohydrodynamic Turbulence

2009-12-18

arxiv.org/abs/0912.3752v1

Phys.Rev.Lett.104:081101,2010

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 2 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.104.081101

We investigate the scale-locality of cascades of conserved invariants at high kinetic and magnetic Reynolds numbers in the ``inertial-inductive range'' of magnetohydrodynamic (MHD) turbulence, where velocity and magnetic field increments exhibit suitable power-law scaling. We prove that fluxes of total energy and cross-helicity--or, equivalently, fluxes of Els\"asser energies--are dominated by the contributions of local triads. Corresponding spectral transfers are also scale-local when defined using octave wavenumber bands. Flux and transfer of magnetic helicity may be dominated by non-local triads. The magnetic stretching term also may be dominated by non-local triads but we prove that it can convert energy only between velocity and magnetic modes at comparable scales. We explain the disagreement with numerical studies that have claimed conversion nonlocally between disparate scales. We present supporting data from a $1024^3$ simulation of forced MHD turbulence.

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