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Paper: On the Parallel Spectrum and Anisotropy in MHD Turbulence
Volume: 498, Numerical Modeling of Space Plasma Flows ASTRONUM-2014
Page: 3
Authors: Beresnyak, A.
Abstract: MHD turbulence is anisotropic and shows different spectral slopes measured parallel and perpendicular to the local magnetic field. Solar wind observations typically show a k–2 power law scaling, which is much steeper than the perpendicular scaling, typically k–5/3. In this paper I show that this scaling could be interpreted as the Lagrangian frequency spectrum ω–2 of the evolving Afvén perturbations. As Alfvén waves propagate exactly along magnetic field lines, the measurement of the spectrum along the field line is equivalent to the measurement of the frequency spectrum. This was tested using high-resolution simulations of MHD turbulence, e.g., I verified that the cutoff of the parallel spectrum scales as Kolmogorov timescale, not lengthscale.
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