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arXiv 0910.0368astro-ph.SR
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零点重联对太阳通量出现重要吗?

Is null-point reconnection important for solar flux emergence?

R. C. Maclean, C. E. Parnell, K. Galsgaard

摘要:

本文研究了在太阳出射通量的三维MHD数值模式中零点重联的作用。该模型由一个扭曲的磁通量管上升通过分层对流区和大气相互作用,并重新连接到一个水平上覆的磁场在大气中。重联开始时出现了重联点,并在出现的其余时间持续存在,它们主要出现在模型光球和过渡区,在出现的通量管的两侧形成两个松散的星团。在任何一个时间存在多达26个零值,并且及时跟踪显示,尽管磁场配置的初始简单,但是总体上存在总共305个零值。我们发现的证据,为现实的零的方法,创造和毁灭,他们的平衡的迹象,他们的寿命长,和他们的几何稳定性。然后,我们表明,由于低的平行电场与零,零点重联是不是主要类型的磁重联参与新出现的磁通量的相互作用与上覆字段。然而,大量的零值意味着磁场的拓扑结构必须非常复杂,并且不能排除沿着分离器或分界线表面的重联对于磁通出现的重要性。

英文摘要:

The role of null-point reconnection in a 3D numerical MHD model of solar emerging flux is investigated. The model consists of a twisted magnetic flux tube rising through a stratified convection zone and atmosphere to interact and reconnect with a horizontal overlying magnetic field in the atmosphere. Null points appear as the reconnection begins and persist throughout the rest of the emergence, where they can be found mostly in the model photosphere and transition region, forming two loose clusters on either side of the emerging flux tube. Up to 26 nulls are present at any one time, and tracking in time shows that there is a total of 305 overall, despite the initial simplicity of the magnetic field configuration. We find evidence for the reality of the nulls in terms of their methods of creation and destruction, their balance of signs, their long lifetimes, and their geometrical stability. We then show that due to the low parallel electric fields associated with the nulls, null-point reconnection is not the main type of magnetic reconnection involved in the interaction of the newly emerged flux with the overlying field. However, the large number of nulls implies that the topological structure of the magnetic field must be very complex and the importance of reconnection along separators or separatrix surfaces for flux emergence cannot be ruled out.

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