SWINGING SPIRAL WAVES AND ALFVEN TURBULENCE IN ACCRETION DISKS

被引：39

作者：

TAGGER, M

PELLAT, R

CORONITI, FV

机构：

[1] ECOLE POLYTECH,CTR PHYS THEOR,F-91128 PALAISEAU,FRANCE

[2] UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024

[3] UNIV CALIF LOS ANGELES,DEPT ASTRON,LOS ANGELES,CA 90024

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 393卷 / 02期

关键词：

ACCRETION; ACCRETION DISKS; INSTABILITIES; MHD; TURBULENCE;

D O I：

10.1086/171539

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the stability of Alfven waves in magnetized accretion disks. Balbus & Hawley have recently found that axisymmetric waves are unstable in high-beta disks. It is shown here that nonaxisymmetric (spiral) waves are subject to a similar but physically different instability, present already at low-beta. Transient wave packets are amplified at the same time as they are sheared by differential rotation in the disk. This instability appears as a very good candidate to explain turbulent accretion, and also to drive outflows in the magnetosphere of the disk.

引用

页码：708 / 715

页数：8

共 12 条

[1] A POWERFUL LOCAL SHEAR INSTABILITY IN WEAKLY MAGNETIZED DISKS .1. LINEAR-ANALYSIS [J].