Observational study of intermittent solar jets: p -mode modulation
Observational study of intermittent solar jets: p -mode modulation
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间歇性太阳喷流的观测研究：p 模式调制
DOI：
10.1051/0004-6361/202348053
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发表时间：
2024
影响因子：
6.5
通讯作者：
Cao, Wenda
中科院分区：
文献类型：
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作者：
Cai, Qiuzhuo;Ruan, Guiping;Zheng, Chenxi;Schmieder, Brigitte;Guo, Jinhan;Chen, Yao;Su, Jiangtao;Liu, Yang;Liu, Jihong;Cao, Wenda
目的在太阳大气中观察到反复出现的喷流。它们可以在很长一段时间内断断续续地喷发。通过对间歇性喷流的观测，我们希望了解是什么原因导致周期性喷发的特征。方法我们报道了由古德太阳望远镜、Hα可见光成像光谱仪和近红外成像光谱仪(NIRIS)观测到的间歇性喷流。该分析得到了界面区域成像光谱仪(IRIS)的1400？和2796？数据的辅助和补充。这些观测仪器使我们能够分析喷气事件的时间特征。通过构造H-α多谱图，我们发现等离子体首先向上运动，但在喷流的第二阶段，等离子体回流。结果喷流持续时间长达4h，时距图显示喷流峰值在18：00UT-18：50UT具有明显的周期喷发特征(5min)。我们还在过渡区(1400？和2796？)观测到的急流爆发过程中发现了一个周期性的亮化现象(5min)，这可能是对太阳上层大气中的间歇性急流的响应。时间滞后为3分钟。在二氧化钛带中的演化图像显示了喷流位置处的颗粒物的水平运动。通过与太阳平静区的比较，我们发现喷流的足点在H-α谱线轮廓的中心被增强，而线翼没有明显的变化。这表明喷气式飞机脚点处的加热时间延长。在喷流的混极性磁场区域，我们观察到磁通量的出现、抵消和剪切，这表明可能存在间歇性的磁重联。用磁摩擦法重建的非线性无力场模型证实了这一点。结论多波长分析表明，我们研究的事件是由混合极性磁场引起的磁重联触发的。我们认为，光球中颗粒的水平运动驱动了磁重联，这是BYP模振荡调制的结果。
AimsRecurring jets are observed in the solar atmosphere. They can erupt intermittently over a long period of time. By the observation of intermittent jets, we wish to understand what causes the characteristics of the periodic eruptions.MethodsWe report intermittent jets observed by the Goode Solar Telescope (GST) with the TiO Broadband Filter Imager (BFI), the Visible Imaging Spectrometer (VIS) in Hα, and the Near-InfraRed Imaging Spectropolarimeter (NIRIS). The analysis was aided and complemented by 1400 Å and 2796 Å data from the Interface Region Imaging Spectrograph (IRIS). These observational instruments allowed us to analyze the temporal characteristics of the jet events. By constructing the Hαdopplergrams, we found that the plasma first moves upward, but during the second phase of the jet, the plasma flows back. Working with time slice diagrams, we investigated the characteristics of the jet dynamics.ResultsThe jet continued for up to 4 h. The time-distance diagram shows that the peak of the jet has clear periodic-eruption characteristics (5 min) during 18:00 UT–18:50 UT. We also found a periodic brightening phenomenon (5 min) during the jet bursts in the observed bands in the transition region (1400 Å and 2796 Å), which may be a response to intermittent jets in the upper solar atmosphere. The time lag is 3 min. Evolutionary images in the TiO band revealed a horizontal movement of the granulation at the location of the jet. By comparison to the quiet region of the Sun, we found that the footpoint of the jet is enhanced at the center of the Hαspectral line profile, without significant changes in the line wings. This suggests prolonged heating at the footpoint of the jet. In the mixed-polarity magnetic field region of the jet, we observed the emergence of magnetic flux, its cancellation, and shear, indicating possible intermittent magnetic reconnection. This is confirmed by the nonlinear force-free field model, which was reconstructed using the magneto-friction method.ConclusionsThe multiwavelength analysis indicates that the events we studied were triggered by magnetic reconnection that was caused by mixed-polarity magnetic fields. We suggest that the horizontal motion of the granulation in the photosphere drives the magnetic reconnection, which is modulated byp-mode oscillations.