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Nonaxisymmetric anisotropy of solar wind turbulence
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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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Official URL: http://dx.doi.org/10.1103/PhysRevLett.107.095002
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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