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arXiv 1504.03563astro-ph.SR
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太阳黑子光桥上方的振荡光墙

Oscillating light wall above a sunspot light bridge

Shuhong Yang, Jun Zhang, Fayu Jiang, Yongyuan Xiang

摘要:

利用高时空分辨率的\emph{Interface Region Imaging Spectrograph} 1330射电图像,我们发现许多明亮的结构根植于NOAA 12192的光桥中,形成一个\emph{light wall}。光墙比周围区域亮,墙顶比墙体亮得多。新真空太阳望远镜H $α$和\emph{Solar Dynamics Observatory} 171和131的图像也被用来研究光壁特性。在1330 nm、171 nm和131 nm处,壁顶发射较高,而在H $α$谱线中,壁顶发射很低。墙体对应于1330 nm处的亮区和其他行中的暗区。光墙的顶部连续地向上和向下移动,在高度上进行振荡。反演的平均高度、振幅、振荡速度和主周期分别为3.6 Mm、0.9 Mm、15.4 km s $^{-1}$和3.9 min。我们解释的光壁的振荡作为\emph{p}模式从光球下面的泄漏。墙壁顶部的恒定亮度增强意味着存在某种大气加热,例如,通过持续的小规模重联或磁声波。在另一系列的1330张照片中,我们发现在向上运动阶段的墙顶比在向下运动阶段明显更亮。这种振荡可能是由间歇性脉冲磁重联释放的能量驱动的。

英文摘要:

With the high tempo-spatial \emph{Interface Region Imaging Spectrograph} 1330 Å images, we find that many bright structures are rooted in the light bridge of NOAA 12192, forming a \emph{light wall}. The light wall is brighter than the surrounding areas, and the wall top is much brighter than the wall body. The New Vacuum Solar Telescope H$α$ and the \emph{Solar Dynamics Observatory} 171 Å and 131 Å images are also used to study the light wall properties. In 1330 Å, 171 Å, and 131 Å, the top of the wall has a higher emission, while in the H$α$ line, the wall top emission is very low. The wall body corresponds to bright areas in 1330 Å and dark areas in the other lines. The top of the light wall moves upward and downward successively, performing oscillations in height. The deprojected mean height, amplitude, oscillation velocity, and the dominant period are determined to be 3.6 Mm, 0.9 Mm, 15.4 km s$^{-1}$, and 3.9 min, respectively. We interpret the oscillations of the light wall as the leakage of \emph{p}-modes from below the photosphere. The constant brightness enhancement of the wall top implies the existence of some kind of atmospheric heating, e.g., via the persistent small-scale reconnection or the magneto-acoustic waves. In another series of 1330 Å images, we find that the wall top in the upward motion phase is significantly brighter than in the downward phase. This kind of oscillations may be powered by the energy released due to intermittent impulsive magnetic reconnection.

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