Multiwavelength Imaging and Spectral Analysis of Jet-like Phenomena in a Solar Active Region Using IRIS and AIA
Multiwavelength Imaging and Spectral Analysis of Jet-like Phenomena in a Solar Active Region Using IRIS and AIA
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DOI：
10.3847/1538-4357/ab974d
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发表时间：
2020-07
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影响因子：
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通讯作者：
Llŷr Dafydd Humphries;E. Verwichte;D. Kuridze;H. Morgan
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文献类型：
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作者：
Llŷr Dafydd Humphries;E. Verwichte;D. Kuridze;H. Morgan
对动力学现象的高分辨率观测有助于深入了解控制太阳低层大气的性质和过程。我们提出了一个类似喷气的现象，从活动区（AR）12192的半影足迹使用成像和光谱观测的界面区域成像光谱仪（IRIS）和大气成像组件（AIA）上的太阳动力学天文台。这些喷流的视线多普勒速度为±10-22 km s-1，明亮的锋面似乎以23-130 km s-1的速度穿过天空。这样的速度比色球层中预期的声速高得多。这些喷流的特征在IRIS和AIA的冷热通道中都可以看到。每个喷流平均持续15分钟，在2小时内出现5-7次。解释这一现象的可能机制被提出，其中最有可能的是由于光球波前或重力波的陡化而导致p-模式或阿尔文波激波串撞击过渡区和日冕。
High-resolution observations of dynamic phenomena give insights into the properties and processes that govern the low solar atmosphere. We present an analysis of jet-like phenomena emanating from a penumbral footpoint in active region (AR) 12192 using imaging and spectral observations from the Interface Region Imaging Spectrograph (IRIS) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. These jets are associated with line-of-sight Doppler speeds of ±10–22 km s−1 and bright fronts that seem to move across the plane-of-sky at speeds of 23–130 km s−1. Such speeds are considerably higher than the expected sound speed in the chromosphere. The jets have signatures that are visible both in the cool and hot channels of IRIS and AIA. Each jet lasts on average 15 minutes and occurs 5–7 times over a period of 2 hr. Possible mechanisms to explain this phenomenon are suggested, the most likely of which involve p-mode or Alfvén wave shock trains impinging on the transition region and corona as a result of steepening photospheric wavefronts or gravity waves.