arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.03976astro-ph.SR
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太阳黑子中光桥和半影之间的磁连通性

Magnetic connectivity between the light bridge and penumbra in a sunspot

Song Feng, Yuhu Miao, Ding Yuan, Zhongquan Qu, Valery M. Nakariakov

摘要:

光桥是太阳黑子内常见的突出结构。它的存在通常会触发太阳黑子的大量动力学,并对太阳黑子的演化产生持久的影响。然而,轻型桥梁的基本结构仍然没有得到很好的理解。在这项研究中,我们使用高分辨率的分光偏振数据获得的太阳光学望远镜搭载的日之出卫星分析的磁和热结构的光桥在\AR。我们还结合了高节奏的$1700\unitÅ$通道数据提供的大气成像组件板载的太阳动力学天文台研究这座桥上的动态。我们发现在这座桥的两端有一对蓝色和红色的多普勒频移斑,这种模式似乎是由磁场的水平分量引导的对流运动,与这座桥的脊柱对齐。成对的上下运动意味着光桥可能有两条腿或波动的磁场。在两端检测到$1700\unitÅ$带通发射强度的显著四分钟振荡,其与成对的蓝移和红移斑块重叠。光桥和半影处的振荡信号彼此高度相关。虽然它们在光球层的空间上是分开的,但周期性似乎有一个共同的起源。因此,我们推断光桥和半影可能共享一个共同的磁源,并在光球层通过磁对流而破碎。

英文摘要:

A light bridge is a prominent structure commonly observed within a sunspot. Its presence usually triggers a wealth of dynamics in a sunspot, and has a lasting impact on sunspot evolution. However, the fundamental structure of light bridges is still not well understood. In this study, we used the high-resolution spectropolarimetry data obtained by the Solar Optical Telescope onboard the Hinode satellite to analyze the magnetic and thermal structure of a light bridge at \AR. We also combined the high-cadence $1700\unitÅ$ channel data provided by the Atmospheric Imaging Assembly onboard the Solar Dynamic Observatory to study the dynamics on this bridge. We found that a pair of blue and red Doppler shift patches at two ends of this bridge, this pattern appears to be the convective motion directed by the horizontal component of the magnetic field aligned with the spine of this bridge. Paired upward and downward motions implies that the light bridge could have a two-legged or undulate magnetic field. Significant four minute oscillations in the emission intensity of the $1700\unitÅ$ bandpass were detected at two ends, which had overlap with the paired blue and red shift patches. The oscillatory signals at the light bridge and the penumbra were highly correlated with each other. Although they are separated in space at the photosphere, the periodicity seems to have a common origin from the underneath. Therefore, we infer that the light bridge and penumbra could share a common magnetic source and become fragmented at the photosphere by magneto-convection.

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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