Rapid alignment of velocity and magnetic field in magnetohydrodynamic turbulence

被引：102

作者：

Matthaeus, W. H. ^{[1
,2
]}

Pouquet, A. ^{[3
]}

Mininni, P. D. ^{[3
,4
]}

Dmitruk, P. ^{[1
,2
,4
]}

Breech, B. ^{[1
,2
]}

机构：

[1] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[3] Natl Ctr Atmospher Res, Boulder, CO 80307 USA

[4] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.100.085003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that local directional alignment of the velocity and magnetic field fluctuations occurs rapidly in magnetohydrodynamics for a variety of parameters and is seen both in direct numerical simulations and in solar wind data. The phenomenon is due to an alignment between magnetic field and gradients of either pressure or kinetic energy, and is similar to alignment of velocity and vorticity in Navier-Stokes turbulence. This rapid and robust relaxation process leads to a local weakening of nonlinear terms.

引用

页数：4

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