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arXiv 1502.01842astro-ph.SRphysics.flu-dynphysics.plasm-ph
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小尺度磁通浮现区浪涌的磁结构

The magnetic structure of surges in small-scale emerging flux regions

David MacTaggart, Salvo Guglielmino, Andrew Haynes, Radostin Simitev, Francesca Zuccarello

摘要:

目的:探讨小尺度活动区形成过程中浪涌与磁重联的关系。特别是,研究如何大规模的几何形状的磁场,形状不同阶段的重联,引导流动的浪涌。方法:我们提出了三个通量涌现模型。第一个模型,也是最简单的模型,由一个进入水平环境场的区域组成,该水平环境场最初平行于该区域的顶部。第二个模型与第一个模型相同,但有一个额外的更小的新兴区域,它扰动了主区域。这是为了创建一个更复杂的磁拓扑结构,并测试与第一个模型相比,这如何使浪涌的发展复杂化。最后一个模型具有非均匀的环境磁场,以模拟太阳黑子场附近的出现的影响,并通过环境磁场对系统施加不对称性。在每个阶段,我们跟踪磁拓扑结构,以确定重联的位置。这允许从不同的拓扑区域绘制场线,突出它们的几何形状如何影响浪涌的发展。结果:在第一个模型中,我们确定了不同阶段的重新连接。每个相位与磁场的特定几何形状相关联,这决定了浪涌的路径。第二个模型遵循与第一个相似的模式,但具有更复杂的磁性拓扑结构和额外的喷发。第三个模型强调了如何不对称的环境场可以导致在首选的位置重新连接,随后引导浪涌的方向。

英文摘要:

Aims: To investigate the relationship between surges and magnetic reconnection during the emergence of small-scale active regions. In particular, to examine how the large-scale geometry of the magnetic field, shaped by different phases of reconnection, guides the flowing of surges. Methods: We present three flux emergence models. The first model, and the simplest, consists of a region emerging into a horizontal ambient field that is initially parallel to the top of the emerging region. The second model is the same as the first but with an extra smaller emerging region which perturbs the main region. This is added to create a more complex magnetic topology and to test how this complicates the development of surges compared to the first model. The last model has a non-uniform ambient magnetic field to model the effects of emergence near a sunspot field and impose asymmetry on the system through the ambient magnetic field. At each stage, we trace the magnetic topology to identify the locations of reconnection. This allows for field lines to be plotted from different topological regions, highlighting how their geometry affects the development of surges. Results: In the first model, we identify distinct phases of reconnection. Each phase is associated with a particular geometry for the magnetic field and this determines the paths of the surges. The second model follows a similar pattern to the first but with a more complex magnetic topology and extra eruptions. The third model highlights how an asymmetric ambient field can result in preferred locations for reconnection, subsequently guiding the direction of surges.

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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