Nonlinearity and Chaos in the Magnetopause Shear System  

作　　者：傅绥燕 濮祖荫 刘振兴 

机构地区：[1]Department of Geophysics and Center for Nonlinear Science, Peking University, Beijing 1000871, PRC [2]Center for Space Science and Application Research, Academia Sinica, Beijing 100080, PRC

出　　处：《Science China Mathematics》1994年第12期1498-1507,共10页中国科学：数学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China,and partly by the NationalBasic Research Program(Nonlinear Science).

摘　　要：Chaotic phenomena in the magnetopause boundary region are studied in the MHD framework by using the Fourier truncation method. The MHD system is considered as a one-dimensional current sheet with a co-existing velocity shear and continuous energy transfer. The nonlinearity of the system, the evolution processes and properties of its different attractors are analysed. The possible routs and parameter conditions for chaos onset are also investigated. Numerical solutions show that when the Reynolds number (R) and the magnetic Reynolds number (Km) are very large, chaos appears in the system and its onset may provide a physical mechanism leading to turbulent reconnection at the magnetopause.Chaotic phenomena in the magnetopause boundary region are studied in the MHD framework by using the Fourier truncation method. The MHD system is considered as a one-dimensional current sheet with a co-existing velocity shear and continuous energy transfer. The nonlinearity of the system, the evolution processes and properties of its different attractors are analysed. The possible routs and parameter conditions for chaos onset are also investigated. Numerical solutions show that when the Reynolds number (R) and the magnetic Reynolds number (Km) are very large, chaos appears in the system and its onset may provide a physical mechanism leading to turbulent reconnection at the magnetopause.

关 键 词：CHAOS ATTRACTOR turbulent RECONNECTION REYNOLDS number magnetic REYNOLDS number. 

分 类 号：O415.5[理学—理论物理]