Journal
ASTROPHYSICAL JOURNAL
Volume 746, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/746/2/184
Keywords
magnetic fields; magnetohydrodynamics (MHD); solar wind; turbulence
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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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