Emergence and interaction of twisted flux tubes in the Sun
Emergence and interaction of twisted flux tubes in the Sun
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DOI：
10.1051/0004-6361:20066508
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发表时间：
2007-04
影响因子：
6.5
通讯作者：
V. Archontis;A. Hood;C. Brady
中科院分区：
文献类型：
--
作者：
V. Archontis;A. Hood;C. Brady
目标。我们展示了数值模拟的结果，研究了一对扭曲的浮力磁通量管的相互作用，这些磁通量管从太阳内部上升到太阳的外部大气层。我们新模型的目标是以自洽的方式重现一些动态太阳现象。方法。我们通过使用拉格朗日重映射、冲击捕获代码 (Lare2D) 求解可压缩和电阻 MHD 方程，在 2.5D 数值实验中执行非线性模拟。对于问题的某些方面，我们使用均匀电阻率和局部增强电阻率来考虑系统的演化。结果。两个通量管同时开始上升，但从光球下方的不同高度开始上升。最初位于靠近地表的前导管（第一管）上升并最终在光球层上方膨胀，为即将到来的系统（第二管）形成磁化大气层。在此类数值实验中，首次通过两个新兴通量系统之间的出现、扩展和动态相互作用自洽地形成了电流片、高速重联射流、等离子体团、环路增亮和拱廊耀斑状结构。
Aims. We present results from numerical simulations that study the interaction of a pair of twisted, buoyant magnetic flux tubes, which rise from the solar interior into the outer atmosphere of the Sun. The aim of our new model is to reproduce some of the dynamic solar phenomena in a self-consistent manner. Methods. We perform non-linear simulations in 2.5D numerical experiments by solving the compressible and resistive MHD equations using a Lagrangian remap, shock capturing code (Lare2D). For some aspects of the problem, we consider the evolution of the system using both uniform and locally enhanced resistivity. Results. The two flux tubes start to rise at the same time but from a different height below the photosphere. The leading (first) tube, which is originally located nearer to the surface, rises and eventually expands above the photosphere forming a magnetized atmosphere for the upcoming system (second tube). Current sheets, high-velocity reconnection jets, plasmoids, loop brightnenings and arcade flare-like structures are formed, for the first time in such numerical experiments, self-consistently by the emergence, expansion and the dynamical interaction between the two emerging flux systems.