引力场中磁场重联的数值研究(IV)多层电流片  

NUMERICAL STUDIES OF MANGNETIC RECONNECTION IN A GRAVITIONAL FIELD (IV) MULTIPLE CURRENT SHEETS

作　　者：王小虎[1] 郑惠南[1] 王水[1] 

机构地区：[1]中国科学技术大学地球和空间科学系

出　　处：《地球物理学报》1999年第1期1-11,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金;国家科学技术部攀登项目资助

摘　　要：应用数值方法研究了日冕多层电流片中电阻撕裂模不稳定性的非线性演化和磁场重联过程，结果表明，计算区域顶部附近两侧电流片中的磁岛和等离子体团向上抛射，并携出大量的磁能和热能；中心电流片中的磁岛向下运动，逐渐演变成底部含有３个磁闭合区的冕流结构。进而在中心电流片中再次发生磁场重联，多次形成向下运动的小型磁岛，并与底部磁闭合区发生结合不稳定性。同时在磁闭合区中也有磁场重联发生，导致中心小磁闭合区的湮灭。初始电流片之间的距离趋近，上述演化过程越快。日冕多层电流片中的磁场重联过程可能对日冕物质抛射和日冕加热有着重要影响。The nonlinear evolution of resistive tearingmode instability and the process of magnetic reconnection in coronal multiple current sheets are studied by a numericalmethod. The results show that the magnetic islands and plasmoids near the top regionof two current sheets on two sides eject upwards with a lot of magnetic energy andthermal energy, while the magnetic island in the cential current sheet movesdownwards and evolves gradually into a corona streamer which contains threemagnetic closed regions in its bottom, Then magnetic reconnection happens again inthe central cunent sheet and small magnetic islands are formed repeatedly, whichmove downwards and coalesce with the magnetic closed region in the bottom by thecoalescence instability. At the same time, magnetic reconnection also happens in themagnetic closed region, which causes the disappearance of the central small magneticclosed region, When the distance between the initial current sheets is shorter, theabove-mentioned evolution happens is faster. The process of magnetic reconnection incorona multiple current sheets may have great influence on corona mass ejection andcorona heating.

关 键 词：磁场重联 多层电流片 日冕物质抛射 磁岛 引力场 

分 类 号：P318.24[天文地球—固体地球物理学]