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Article Dans Une Revue Physical Review Letters Année : 2010

Three dimensional anisotropic k-spectra of turbulence at sub-proton scales in the solar wind

Résumé

We show the first three dimensional (3D) dispersion relations and k spectra of magnetic turbulence in the solar wind at subproton scales. We used the Cluster data with short separations and applied the k-filtering technique to the frequency range where the transition to subproton scales occurs. We show that the cascade is carried by highly oblique kinetic Alfve´n waves with !plas 0:1!ci down to k?i 2. Each k spectrum in the direction perpendicular to B0 shows two scaling ranges separated by a breakpoint (in the interval ½0:4; 1k?i): a Kolmogorov scaling k1:7 ? followed by a steeper scaling k4:5 ? . We conjecture that the turbulence undergoes a transition range, where part of the energy is dissipated into proton heating via Landau damping and the remaining energy cascades down to electron scales where electron Landau damping may predominate.

Dates et versions

hal-00520765 , version 1 (24-09-2010)

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Fouad Sahraoui, M.L. Goldstein, Gérard Belmont, Patrick Canu, Laurence Rezeau. Three dimensional anisotropic k-spectra of turbulence at sub-proton scales in the solar wind. Physical Review Letters, 2010, 105, pp.131101. ⟨10.1103/PhysRevLett.105.131101⟩. ⟨hal-00520765⟩
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