Wave decay in magnetohydrodynamic turbulence

被引：23

作者：

Beresnyak, Andrey ^{[1
]}

Lazarian, Alex ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 678卷 / 02期

基金：

美国国家科学基金会;

关键词：

MHD; turbulence;

D O I：

10.1086/587052

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a model for nonlinear decay of the weak wave in three-dimensional incompressible magnetohydrodynamic (MHD) turbulence. We show that the decay rate is different for parallel and perpendicular waves. We provide a general formula for arbitrarily directed waves and discuss particular limiting cases known in the literature. We test our predictions with direct numerical simulations of wave decay in three-dimensional MHD turbulence, and discuss the influence of turbulent damping on the development of linear instabilities in the interstellar medium and on other important astrophysical processes.

引用

页码：961 / 967

页数：7

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