| 磁层顶边界区剪切流MHD不稳定性的数值模拟研究 III.大振幅MHD波 |
| |
| 引用本文： | 严明,濮祖荫.磁层顶边界区剪切流MHD不稳定性的数值模拟研究 III.大振幅MHD波[J].空间科学学报,1989,9(4):260-270. |
| |
| 作者姓名： | 严明 濮祖荫 |
| |
| 作者单位： | 1.中国科学院空间科学与应用研究中心, 北京 |
| |
| 摘 要： | 本文用MHD二维不可压模式, 对Kelvin-Helmholtz不稳定性激发的非线性波动进行数值模拟.指出:K-H波动有两个吸引子:(1)定常吸引子;(2)周期吸引子.在Alfvén马赫数MA>8时, 波动长时间发展渐近于定常态;在MA<8时, 波动渐近于周期吸引子.在磁层顶K-H波动中, 一般MA<8, 波动幅度呈周期变化形态, 即包络孤立子形态.本文还讨论了磁场-磁层顶K-H不稳定性中的作用, 指出:磁场可大大加强从磁鞘向磁层顶的动量输运.
|
| 收稿时间： | 1988-10-22 |
SIMULATION STUDY OF THE MHD INSTABILITIES CAUSED BY THE SHEARED FLOW AT THE BOUNDARYLAYER OF THE MAGNETOSPHERE |
| |
| Institution: | 1.Center for Space Science and Applied Research, Academia Sinica, Beijing2.Department of Geophysics, Peking University, Beijing |
| |
| Abstract: | Atwo dimension incompressive MHDsimulation is carried out to study the nonlinear waves caused by Kelvin-Helmholtz instability. It is found that three are two attractors. When MA>8, the system develops towards a steady state one; When MA<8, it develops towards a periodic attractor. At the boundarylayer of the magnetosphere, the condition of MA<8 is sa-tified. As a result the amplitude of the K-Hwaves should change periodically. The role of magnetic field in K-Hinstability is also studied. The magnetic field may make the transport of the momentum more efficient. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《空间科学学报》浏览原始摘要信息 |
| 点击此处可从《空间科学学报》下载免费的PDF全文 |
|
