摘要
本文用谱截断方法研究了磁层顶剪切磁流体的非线性性态。结果表明:流场扰动会使系统出现剪切不稳定(K-H不稳定)性;系统具有对初值的敏感性,这是导致湍动而使磁层顶动力学性态难以预测的根本原因;流场粘性及流场与磁场的相互作用使能量与动量在流场与磁场中转化和传输;外界能流通过粘性与耦合作用可周而复始地在系统中传递。
In this paper, using the method of cut off spectrum, the nonlinear properties of the sheared magnetohydradynamics at the boundary layer of the magnetosphere are investigated. The primary results are: (1) the perturbation of flow causes the K-H instability; (2) the system is sensitive to the initial conditions, this will lead to purturbations of the system and is an essential reason why the dynamic property of the magnetopause is difficult to predict; (3) the kinematic viscoisity and the interactions between flow and magnetic field may make the transfer of the momentum and energy; (4) the energy from outside may be transported into the system by the kinematic viscosity and couplings between flow and magnetic field.
出处
《空间科学学报》
CAS
CSCD
北大核心
1991年第3期193-200,共8页
Chinese Journal of Space Science
关键词
磁层顶
剪切磁流体
非线性性态
Magnetosphere, Boundarylayer, Shere MHD, Nonlinear property
