Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-24
Phys.Rev.Lett.99:254502,2007
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.99.254502
We present a numerical analysis of an incompressible decaying magnetohydrodynamic turbulence run on a grid of 1536^3 points. The Taylor Reynolds number at the maximum of dissipation is ~1100, and the initial condition is a superposition of large scale ABC flows and random noise at small scales, with no uniform magnetic field. The initial kinetic and magnetic energies are equal, with negligible correlation. The resulting energy spectrum is a combination of two components, each moderately resolved. Isotropy obtains in the large scales, with a spectral law compatible with the Iroshnikov-Kraichnan theory stemming from the weakening of nonlinear interactions due to Alfven waves; scaling of structure functions confirms the non-Kolmogorovian nature of the flow in this range. At small scales, weak turbulence emerges with a k_{\perp}^{-2} spectrum, the perpendicular direction referring to the local quasi-uniform magnetic field.
Mininni Pablo Daniel
Pouquet Annick
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