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KOLMOGOROV VECTORIAL LAW FOR SOLAR WIND TURBULENCE

TitreKOLMOGOROV VECTORIAL LAW FOR SOLAR WIND TURBULENCE
Type de publicationJournal Article
Year of Publication2012
AuteursGaltier, S
JournalAstrophysical Journal
Volume746
Date PublishedFeb
ISBN Number0004-637X
Numéro d'accèsWOS:000300406300070
Résumé

We investigate a class of axisymmetric magnetohydrodynamic turbulence which satisfies the exact relation for third-order Elsasser 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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