Energy decay laws in strongly anisotropic magnetohydrodynamic turbulence |
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Authors: | Bigot Barbara Galtier Sébastien Politano Hélène |
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Affiliation: | Institut d'Astrophysique Spatiale, Batiment 121, F-91405 Orsay (France); Université Paris-Sud XI and CNRS (UMR 8617), France. |
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Abstract: | We investigate the influence of a uniform magnetic field B(0)=B(0)e( parallel) on energy decay laws in incompressible magnetohydrodynamic (MHD) turbulence. The nonlinear transfer reduction along B(0) is included in a model that distinguishes parallel and perpendicular directions, following a phenomenology of Kraichnan. We predict a slowing down of the energy decay due to anisotropy in the limit of strong B(0), with distinct power laws for energy decay of shear- and pseudo-Alfvén waves. Numerical results from the kinetic equations of Alfvén wave turbulence recover these predictions, and MHD numerical results clearly tend to follow them in the lowest perpendicular planes. |
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