电流片的自发重联与无力场──磁岛的形成  

SPONTANEOUS RECONNECTION OF CURRENT SHEETS AND FORCE-FREE FIELD──FORMATION OF MAGNETIC ISLANDS

作　　者：李醒[1] 胡友秋[1] 

机构地区：[1]中国科学技术大学地球与空间科学系

出　　处：《空间科学学报》1995年第1期1-7,共7页Chinese Journal of Space Science

基　　金：中国科技大学青年基金会;中科院天文委员会的资助

摘　　要：采用二维三分量磁流体力学数值模拟方法，研究了线性无力场对电流片的自发重联的影响．结果表明：电流片的背景场（无力场）对重联的拓扑位形有重要的影响，当无力场因子达到一定值时，在模拟区域内出现大范围的磁岛，磁岛厚度随时间的发展而增加，而无力场因子较小时则没有磁岛形成．当无力场因子为零时，即回到普通的位场情形的单ｘ线重联，位场情形磁场拓扑位形与Ｓｃｈｏｌａｒ的结果一致．Using the multistep implicit scheme,a numerical study was made to reveal the influence of linear force-free field to the spontaneous reconnection of current sheets.It is found that the background field (force-free field)of current sheets can strongly affect the topology of the reconnection.When the force-free factor a reaches a critical value,a big area of magnetic island forms in the simulation domain,and the thickness of the island is an increasing function of times.But if the force-free factor is smaller,than the critical value, no islands can be formed.When a is zero,it turns to the common single X line reconnection of potential field.The reconnection topology of the potential field agrees to that of Scholar.

关 键 词：磁场重联 无力场 电流片 空间物理学 磁岛 

分 类 号：P354[天文地球—空间物理学]