ANISOTROPIC INTERMITTENCY OF MAGNETOHYDRODYNAMIC TURBULENCE

被引：32

作者：

Osman, K. T. ^{[1
]}

Kiyani, K. H. ^{[1
,2
]}

Chapman, S. C. ^{[1
,3
,4
]}

Hnat, B. ^{[1
]}

机构：

[1] Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

[2] Ecole Polytech, Lab Phys Plasmas, F-91128 Palaiseau, France

[3] Univ Tromso, Dept Math & Stat, NO-9037 Tromso, Norway

[4] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 783卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

magnetohydrodynamics (MHD); plasmas; solar wind; turbulence; SOLAR-WIND TURBULENCE; MAGNETIC-FIELD; PLASMA; CASCADES; PARTICLES; FLUID; MODEL;

D O I：

10.1088/2041-8205/783/2/L27

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 Elsasser field fluctuations is that of a non-Gaussian globally scale-invariant process. This is distinct from the classic multiexponent 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.

引用

页数：4

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