Kolmogorov Vectorial Law for Solar Wind Turbulence

Details Kolmogorov Vectorial Law for Solar Wind Turbulence Kolmogorov Vectorial Law for Solar Wind Turbulence

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...746..184g&link_type=abstract

The Astrophysical Journal, Volume 746, Issue 2, article id. 184 (2012).

Astronomy and Astrophysics

Astronomy

Magnetic Fields, Magnetohydrodynamics: Mhd, Solar Wind, Turbulence

Scientific paper

We investigate a class of axisymmetric magnetohydrodynamic turbulence which satisfies the exact relation for third-order Elsässer structure functions. Following the critical balance conjecture, we assume the existence of a power-law relation between correlation length scales along and transverse to the local mean magnetic field direction. The flow direction of the vector third-order moments F ± is then along axisymmetric concave/convex surfaces, the axis of symmetry being given by the mean magnetic field. Under this consideration, the vector F ± satisfies a simple Kolmogorov law which depends on the anisotropic parameter a ±, which measures the concavity of the surfaces. A comparison with recent in situ multispacecraft solar wind observations is made; it is concluded that the underlying turbulence is very likely convex. A discussion is given about the physical meaning of such an anisotropy.

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