CONVECTIVE AMPLIFICATION OF DRIFT-ACOUSTIC WAVES IN SHEARED FLOWS

被引:10
作者
WAELBROECK, FL
DONG, JQ
HORTON, W
YUSHMANOV, PN
机构
[1] Institute for Fusion Studies, University of Texas at Austin, Austin
关键词
D O I
10.1063/1.870848
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The evolution of wave packets is investigated in a cold-ion plasma model with sheared magnetic and velocity fields. Wave packets may be amplified by the drift Kelvin-Helmholtz mechanism even when the velocity shear is such that normal modes are stable. It is shown that the logarithm of the convective amplification can be an order of magnitude greater than the logarithm of the steady-state amplification often taken as the measure of convective instability. For a given wave number, the maximum of either of these amplifications decreases only as the inverse of the perpendicular component of the velocity shear. © 1994 American Institute of Physics.
引用
收藏
页码:3742 / 3750
页数:9
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