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非均匀动压冲击和停止后产生的瞬时重联过程
Alternative TitleTRANSIENT RECONNECTION CAUSED BY IMPACT AND SUDDEN STOP OF NON-HOMOGENEOUSDYNAMIC PRESSURE
刘振光; 陈涛; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication地球物理学报
2000
Volume43Issue:4Pages:443-450
ISSN0001-5733
Language中文
Keyword等离子体边界层 动压冲击 瞬时磁场重联 磁层顶
Abstract在非均匀动压冲击期间和冲击突然停止,可引起等离子体边界层的局部瞬时重联过程,本文用二维可压缩MHD数值模拟方法研究了这两个过程.结果表明:当大尺度的均匀横向流从一侧边冲击边界层时,磁力线不弯曲,也不发生磁场重联,只是边界层被推着向下游运动;当局部的非均匀动压(特别是横向剪切流)冲击边界层时,被冲击的同向磁场区磁力线逐渐弯曲,在弯曲的反磁场区,出现磁岛,然后在电流片区发生磁场重联,且逐渐形成准稳态逐
Other AbstractLocal and transient reconnection in the plasma boundary layer may be caused by impact and sudden stop of the non-homogeneous dynamic pressure.The two-dimensional compressible MHD simulation code is used to investigate the reconnection processes in the two cases.It is found that the state of transverse flow and its lasting period play an important role in the reconnection processes.For homogeneous transverse flow reconnection down't occur and the magnetic field lines are only pushed downstream.For sheared transverse flow magnetic reconnection always occurs during the impacting period,and a new "reverse K" pattern reconnection configuration is formed in the current sheet region: after the external shear flow sudden stop,the system of the plasma boundary layer becomes very unstable,many kind of fluid vertex,flow pattern,and reconnection configuration are generated in the current sheet region,the reconnection configurations are very different from that for impacting phase.We suppose that the sudden stop of an external flow action may be an important triggering mechanism of energy conversion and magnetic reconnection. According to the simulation an alternative transient reconnection model has been proposed, and called "Transverse Shear Flow Driver Reconnection" model.This model is very different from MXR model,VIR model and BSXR model.The reconnection mechanism proposed in this paper may exist in some regions of space plasma,such as the subsolar point region of dayside magnetopause boundary layer. This reconnection model can be used to investigate the formation and structure of FTEs,oscillation of magnetopause,vortex structure and wave excitation of in the dayside magnetopause boundary layer.
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1363
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
刘振光,陈涛,北京8701信箱. 非均匀动压冲击和停止后产生的瞬时重联过程[J]. 地球物理学报,2000,43(4):443-450.
APA 刘振光,陈涛,&北京8701信箱.(2000).非均匀动压冲击和停止后产生的瞬时重联过程.地球物理学报,43(4),443-450.
MLA 刘振光,et al."非均匀动压冲击和停止后产生的瞬时重联过程".地球物理学报 43.4(2000):443-450.
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