Magnetohydrodynamics turbulence: waves or eddies?

Details Magnetohydrodynamics turbulence: waves or eddies? Magnetohydrodynamics turbulence: waves or eddies?

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..399g&link_type=abstract

SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,

Physics

Turbulence, Magnetohydrodynamics, Solar Physics, Alfv\'En Waves

Scientific paper

The dynamics of 3D incompressible MHD turbulence is strongly affected by the presence of a large-scale magnetic field B_0. In a recent work we have investigated through high-resolution direct numerical simulations this dynamics for a driven turbulence. The analysis reveals a non trivial interaction between the 2D state (eddy turbulence) and the 3D modes (wave turbulence). In particular, it is shown that an initial 2D state without energy is unstable: energy is transfered from the 3D modes to the 2D state with an effectiveness larger for stronger B_0. In this case, the final state is a mixture of eddy and Alfvén wave turbulence.

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