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Statistical Study of Network Jets Observed in the Solar Transition Region: a Comparison Between Coronal Holes and Quiet-Sun Regions

Solar Physics(2016)

Indian Institute of Astrophysics

Cited 36|Views22
Abstract
Recent IRIS observations have revealed a prevalence of intermittent small-scale jets with apparent speeds of 80 - 250 km s$^{-1}$, emanating from small-scale bright regions inside network boundaries of coronal holes. We find that these network jets appear not only in coronal holes but also in quiet-sun regions. Using IRIS 1330A (C II) slit-jaw images, we extract several parameters of these network jets, e.g. apparent speed, length, lifetime and increase in foot-point brightness. Using several observations, we find that some properties of the jets are very similar but others are obviously different between the quiet sun and coronal holes. For example, our study shows that the coronal-hole jets appear to be faster and longer than those in the quiet sun. This can be directly attributed to a difference in the magnetic configuration of the two regions with open magnetic field lines rooted in coronal holes and magnetic loops often present in quiet sun. We have also detected compact bright loops, likely transition region loops, mostly in quiet sun. These small loop-like regions are generally devoid of network jets. In spite of different magnetic structures in the coronal hole and quiet sun in the transition region, there appears to be no substantial difference for the increase in foot-point brightness of the jets, which suggests that the generation mechanism of these network jets is likely the same in both regions.
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Chromosphere,Transition region,Coronal hole,Jets
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要点】:该论文通过比较活动区冕洞和宁静日冕区的网络喷流,发现冕洞中的网络喷流速度更快、尺度更大,这主要由两者磁结构的不同所致,而喷流底部亮度的增加则表明喷流的生成机制可能相同。

方法】:研究者使用了IRIS望远镜的1330 Å (C II) 光谱成像数据,提取了网络喷流的各项参数,如视速度、长度、生命周期以及喷流导致底部亮度增加的程度。

实验】:通过对比冕洞和宁静日冕区的多次观测,发现尽管两者的磁结构不同,冕洞中开放磁力线,而宁静日冕区通常是闭合的磁 loops,但喷流底部亮度的增加在两者之间没有显著差异,表明喷流的生成机制可能相似。使用的数据集为IRIS的1330 Å (C II) 谱线成像数据。