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arXiv 1009.1995astro-ph.SRastro-ph.IM
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最高分辨率下太阳黑子内部和周围的速度场

Velocity fields in and around sunspots at the highest resolution

Carsten Denker, Meetu Verma

摘要:

太阳黑子内部和周围的流动细节丰富。从与水平半影磁场同空间的沿低洼流动通道的Evershed流开始,Evershed云可能在太阳黑子的外围继续这种运动,作为太阳黑子护城河中的移动磁性特征。除了这些有序的流动之外,在复杂的太阳黑子中还发现了特殊的运动,它们有助于磁剪切的建立或松弛。原则上,可以捕获这些速度场的三维结构。速度矢量的视线分量可以通过光谱测量获得,而局部相关或特征跟踪技术提供了评估水平自行的手段。下一代地面太阳望远镜将提供分光偏振数据,分辨50公里以下的太阳精细结构。因此,这些新的望远镜与先进的后聚焦仪器作为一个“变焦镜头”,以研究复杂的表面流动与太阳黑子。伴随着从太空进行的“广角”观测,我们现在有机会将太阳黑子描述为一个系统。这篇评论报告了最近与太阳黑子内部和周围流动有关的发现,并强调了先进仪器在发现过程中的作用。

英文摘要:

The flows in and around sunspots are rich in detail. Starting with the Evershed flow along low-lying flow channels, which are cospatial with the horizontal penumbral magnetic fields, Evershed clouds may continue this motion at the periphery of the sunspot as moving magnetic features in the sunspot moat. Besides these well-ordered flows, peculiar motions are found in complex sunspots, where they contribute to the build-up or relaxation of magnetic shear. In principle, the three-dimensional structure of these velocity fields can be captured. The line-of-sight component of the velocity vector is accessible with spectroscopic measurements, whereas local correlation or feature tracking techniques provide the means to assess horizontal proper motions. The next generation of ground-based solar telescopes will provide spectropolarimetric data resolving solar fine structure with sizes below 50 km. Thus, these new telescopes with advanced post-focus instruments act as a "zoom lens" to study the intricate surface flows associated with sunspots. Accompanied by "wide-angle" observations from space, we have now the opportunity to describe sunspots as a system. This review reports recent findings related to flows in and around sunspots and highlights the role of advanced instrumentation in the discovery process.

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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