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Communication Dans Un Congrès Année : 2016

Coexistence of weak and strong wave turbulence in incompressible Hall MHD

Résumé

We report a numerical investigation of 3D Hall Magnetohydrodynamic turbulence with a strong mean magnetic field. By using a helicity decomposition and a cross-bicoherence analysis, we observe that the nonlinear 3-wave coupling is substantial among ion cyclotron and whistler waves. By studying in detail the degree of nonlinearity of these two populations we show that ion cyclotron and whistler turbulent fluctuations belong respectively to strong and weak wave turbulence. The non trivial blending of these two regime give rise to anomalous anisotropy and scaling properties. The separation of the weak random wave and strong coherent turbulence component can however be effectively done using simultaneous space and time Fourier transforms. Using this techniques we show that it is possible to recover some statistical prediction of weak turbulent theory.
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Dates et versions

hal-02796745 , version 1 (05-06-2020)

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  • HAL Id : hal-02796745 , version 1

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Romain Meyrand, K. H. Kiyani, Sébastien Galtier. Coexistence of weak and strong wave turbulence in incompressible Hall MHD. EGU General Assembly 2016, Apr 2016, Vienna, Austria. pp.EPSC2016-18282. ⟨hal-02796745⟩
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