Turner, A. J. (Andrew J.), Gogoberidze, Grigol, Chapman, Sandra C., Hnat, B. and Müller, W.-C.. (2011) Nonaxisymmetric anisotropy of solar wind turbulence. Physical Review Letters, Vol.107 (No.9). Article no. 095002 . ISSN 0031-9007

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Abstract

A key prediction of turbulence theories is frame-invariance, and in magnetohydrodynamic (MHD) turbulence, axisymmetry of fluctuations with respect to the background magnetic field. Paradoxically the power in fluctuations in the turbulent solar wind are observed to be ordered with respect to the bulk macroscopic flow as well as the background magnetic field. Here, nonaxisymmetry across the inertial and dissipation ranges is quantified using in situ observations from Cluster. The observed inertial range nonaxisymmetry is reproduced by a "fly through" sampling of a direct numerical simulation of MHD turbulence. Furthermore, fly through sampling of a linear superposition of transverse waves with axisymmetric fluctuations generates the trend in nonaxisymmetry with power spectral exponent. The observed nonaxisymmetric anisotropy may thus simply arise as a sampling effect related to Taylor's hypothesis and is not related to the plasma dynamics itself.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Interplanetary magnetic fields, Anisotropy, Solar wind, Magnetohydrodynamic waves, Heliosphere (Astrophysics)
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Date:	August 2011
Volume:	Vol.107
Number:	No.9
Page Range:	Article no. 095002
Identification Number:	10.1103/PhysRevLett.107.095002
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Science and Technology Facilities Council (Great Britain) (STFC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/38492

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