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Anisotropic intermittency of magnetohydrodynamic turbulence
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Osman, K. T., Kiyani, K., Chapman, Sandra C. and Hnat, B. (2014) Anisotropic intermittency of magnetohydrodynamic turbulence. The Astrophysical Journal Letters, Volume 783 (Number 2). Article number L27. doi:10.1088/2041-8205/783/2/L27 ISSN 2041-8205.
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Official URL: http://dx.doi.org/10.1088/2041-8205/783/2/L27
Abstract
A higher-order multiscale analysis of spatial anisotropy in inertial range magnetohydrodynamic turbulence is presented using measurements from the STEREO spacecraft in fast ambient solar wind. We show for the first time that, when measuring parallel to the local magnetic field direction, the full statistical signature of the magnetic and Els\"asser field fluctuations is that of a non-Gaussian globally scale-invariant process. This is distinct from the classic multi-exponent statistics observed when the local magnetic field is perpendicular to the flow direction. These observations are interpreted as evidence for the weakness, or absence, of a parallel magnetofluid turbulence energy cascade. As such, these results present strong observational constraints on the statistical nature of intermittency in turbulent plasmas.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Library of Congress Subject Headings (LCSH): | Magnetohydrodynamic waves, Solar wind | ||||||||||
| Journal or Publication Title: | The Astrophysical Journal Letters | ||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||
| ISSN: | 2041-8205 | ||||||||||
| Official Date: | 10 March 2014 | ||||||||||
| Dates: |
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| Volume: | Volume 783 | ||||||||||
| Number: | Number 2 | ||||||||||
| Number of Pages: | 4 | ||||||||||
| Article Number: | Article number L27 | ||||||||||
| DOI: | 10.1088/2041-8205/783/2/L27 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Date of first compliant deposit: | 27 December 2015 | ||||||||||
| Date of first compliant Open Access: | 27 December 2015 | ||||||||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Engineering and Physical Sciences Research Council (EPSRC), Seventh Framework Programme (European Commission) (FP7) | ||||||||||
| Grant number: | PIRSES-2010-269297 |
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