Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvl.105m1101s&link_type=abstract
Physical Review Letters, vol. 105, Issue 13, id. 131101
Physics
44
Particle Emission, Solar Wind, Plasma Turbulence, Turbulence, Magnetohydrodynamics And Plasmas
Scientific paper
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 Alfvén waves with ωplas≤0.1ωci down to k⊥ρi˜2. Each k spectrum in the direction perpendicular to B0 shows two scaling ranges separated by a breakpoint (in the interval [0.4,1]k⊥ρi): a Kolmogorov scaling k⊥-1.7 followed by a steeper scaling ˜k⊥-4.5. 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.
Belmont Gérard
Canu Paolo
Goldstein Michel L.
Rezeau Laurence
Sahraoui Fouad
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