Searching for signatures of H α spicule-like features in the solar transition region
Searching for signatures of H α spicule-like features in the solar transition region
复制标题
寻找太阳过渡区域 H α 针状特征的特征
DOI：
10.1093/mnras/stad1742
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发表时间：
2023
影响因子：
4.8
通讯作者：
Doyle, J. Gerry
中科院分区：
文献类型：
--
作者：
Vilangot Nhalil, Nived;Shetye, Juie;Doyle, J. Gerry
覆盖光学和紫外光谱区域的新仪器和望远镜揭示了一系列小尺度的动态特征，其中许多可能是相关的。例如，针状特征的范围暗示了一系列特征，而不仅仅是两种类型；然而，需要在跟踪多个波长的针状特征方面的直接观测证据，以便进一步洞察太阳外层大气的动态。本文使用瑞典1米太阳望远镜上的CRISP成像光谱偏振仪获得的H α数据，并在过渡区使用SJI1400ä通道的界面成像光谱仪以及通过Siiv1394ä线路的光谱数据来跟踪称为快速蓝移偏移(RBES)的针状物。在这里呈现的Hα蓝翼图像中看到的RBE可以细分为两类：单线程或多线程特征。根据H-α谱，这些特征可分为展宽和线核吸收的事件、展宽和线核发射的事件、在红翼没有任何吸收的纯蓝移的H-α谱线和在蓝色吸收比红翼更强的展宽的谱线。从具有Siiv1394äline轮廓的类似RBE的事件中，78%的 显示Siivline通量增加。这些特征中的大多数都显示了第二个加宽的SiivComponent，略有蓝移。
New instruments and telescopes covering the optical and ultraviolet spectral regions have revealed a range of small-scale dynamic features, many which may be related. For example, the range of spicule-like features hints towards a spectrum of features and not just two types; however, direct observational evidence in terms of tracking spicules across multiple wavelengths is needed in order to provide further insight into the dynamics of the Sun’s outer atmosphere. This paper uses H α data obtained with the CRisp Imaging SpectroPolarimeter instrument on the Swedish 1-m Solar Telescope, and in the transition region using the Interface Region Imaging Spectrograph with the SJI 1400 Å channel plus spectral data via the Siiv1394 Å line to track spicules termed rapid blueshifted excursions (RBEs). The RBEs as seen in the H α blue wing images presented here can be subdivided into two categories: a single or multithreaded feature. Based on the H α spectra, the features can be divided into events showing broadening and line core absorption, events showing broadening and line core emission, events with a pure blueshifted H α profile without any absorption in the red wing, and broadened line profile with the absorption in the blue stronger compared to the red wing. From the RBE-like events that have a Siiv1394 Å line profile, 78 per cent of them show a Siivline flux increase. Most of these features show a second broadened Siivcomponent that is slightly blueshifted.