Isotropic Scale-Invariant Dissipation of Solar Wind Turbulence

Details Isotropic Scale-Invariant Dissipation of Solar Wind Turbulence Isotropic Scale-Invariant Dissipation of Solar Wind Turbulence

2010-08-03

arxiv.org/abs/1008.0525v1

Physics

Space Physics

5 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

The anisotropic nature of solar wind magnetic fluctuations is investigated scale-by-scale using high cadence in-situ magnetic field measurements spanning five decades in scales from the inertial to dissipation ranges of plasma turbulence. We find an abrupt transition at ion kinetic scales to a single isotropic stochastic process that characterizes the dissipation range on all observable scales. In contrast to the inertial range, this is accompanied by a successive scale-invariant reduction in the ratio between parallel and transverse power. We suggest a possible phase space mechanism for this, based on nonlinear wave-particle interactions, operating in this scale-invariant isotropic manner.

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