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arXiv 1003.2349astro-ph.SR
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活动区的太阳回归喷流

Recurrent solar jets in active regions

V. Archontis, K. Tsinganos, C. Gontikakis

摘要:

我们研究了进入太阳大气的环形通量管的出现及其与活动区的预先存在的场的相互作用。我们研究了碰撞磁场之间重复重联事件导致的喷流发射。我们进行三维模拟,通过解决时间相关的,电阻MHD方程在高度分层的大气。环形磁通量管的出现构成了一个小的有源区场。当新出现的磁通量与活动区的环境场接触时,电流结构就建立起来,并且重联开始。在重联期间,电流结构周围的磁场的拓扑结构被急剧修改。这种变化导致新的磁系统的形成,最终碰撞并重新连接。我们发现,重联喷流发生在连续的经常性阶段,在相互垂直的方向,而在每个阶段,他们释放磁能和热等离子体进入太阳大气。在一系列重复出现的喷流之后,系统接近一个平衡,在这个平衡中重联的效率大大降低。我们推断,新磁通量的出现会对活动区磁场产生扰动,从而导致相邻磁场之间的重新连接,并以喷流状发射的形式释放捕获的能量。这是第一次在三维磁通量出射实验中显示出活动区喷流的自洽递归。

英文摘要:

We study the emergence of a toroidal flux tube into the solar atmosphere and its interaction with a pre-existing field of an active region. We investigate the emission of jets as a result of repeated reconnection events between colliding magnetic fields. We perform 3D simulations by solving the time-dependent, resistive MHD equations in a highly stratified atmosphere. A small active region field is constructed by the emergence of a toroidal magnetic flux tube. A current structure is build up and reconnection sets in when new emerging flux comes into contact with the ambient field of the active region. The topology of the magnetic field around the current structure is drastically modified during reconnection. The modification results in a formation of new magnetic systems that eventually collide and reconnect. We find that reconnection jets are taking place in successive recurrent phases in directions perpendicular to each other, while in each phase they release magnetic energy and hot plasma into the solar atmosphere. After a series of recurrent appearance of jets, the system approaches an equilibrium where the efficiency of the reconnection is substantially reduced. We deduce that the emergence of new magnetic flux introduces a perturbation to the active region field, which in turn causes reconnection between neighboring magnetic fields and the release of the trapped energy in the form of jet-like emissions. This is the first time that self-consistent recurrency of jets in active regions is shown in a three-dimensional experiment of magnetic flux emergence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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