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arXiv 2010.04042astro-ph.SRphysics.space-ph
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利用IRIS和AIA对太阳活动区类喷流现象的多波长成像和光谱分析

Multiwavelength Imaging and Spectral Analysis of Jet-like Phenomena in a Solar Active Region Using IRIS and AIA

Llŷr Dafydd Humphries, Erwin Verwichte, David Kuridze, Huw Morgan

摘要:

对动力学现象的高分辨率观测使人们能够深入了解控制太阳低层大气的性质和过程。我们提出了类似喷气现象的分析,从活动区(AR)12192半影脚点使用成像和光谱观测的界面区成像光谱仪(IRIS)和大气成像组件(AIA)上的太阳动力学天文台。这些喷流与$\pm$ 10-22 km s $^{-1}$的视线(LoS)多普勒速度和似乎以23-130 km s $^{-1}$的速度穿过天空平面(PoS)的明亮锋面有关。这样的速度比色球层中预期的声速高得多。在IRIS和AIA的冷通道和热通道中都可以看到喷流的特征。每次喷射平均持续15分钟,在2小时内发生5-7次。提出了解释这一现象的可能机制,其中最有可能的机制是由于光球波阵面或重力波的陡化而导致p模或Alfven波冲击序列撞击过渡区(TR)和日冕。

英文摘要:

High-resolution observations of dynamic phenomena give insight into properties and processes that govern the low solar atmosphere. We present the analysis of jet-like phenomena emanating from a penumbral foot-point 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 (LoS) Doppler speeds of $\pm$ 10-22 km s$^{-1}$ and bright fronts which seem to move across the Plane-of-Sky (PoS) 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 which are visible both in the cool and hot channels of IRIS and AIA. Each jet lasts on average 15 minutes and occur 5-7 times over a period of 2 hours. Possible mechanisms to explain this phenomenon are suggested, the most likely of which involve p-mode or Alfv\' en wave shock trains impinging on the transition region (TR) and corona as a result of steepening photospheric wavefronts or gravity waves.

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