论文标题
冠状基部动态原纤维的签名：太阳轨道/EUI的观测值
Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI
论文作者
论文摘要
太阳能球体具有多种瞬变，包括动态原纤维（DFS），这些动态原纤维（DFS）通常通过H $α$诊断剂在活性区域中看到的细长，类似喷气的特征。到目前为止，这些特征在冠状图像中很难识别，这主要是由于它们的小尺寸和当前EUV成像仪的较低空间分辨率。在这里，我们使用板太阳轨道上的极端紫外线成像仪（EUI）的高分辨率图像介绍了冠状EUV数据中DFS的第一个明确特征。使用EUI的174〜高分辨率成像仪（HRI $ _ {euv} $）获得的数据，我们发现了许多像0.3-0.5毫米的尺寸为0.3-0.5 mm的明亮点状特征，它们在活动区域的核心中上下移动（通常是反复的）。在时空图中，这些特征会产生类似于DFS色球层观测的抛物线轨道。诸如它们的速度（14 km〜s $^{ - 1} $），寿命（332〜S），减速（82 m〜s $^{ - 2} $）和长度（1293〜 km）之类的属性也让人想起彩色层DFS。 EUI数据强烈表明，这些EUV明亮的点基本上是（较冷的色球dfs的热尖），由于缺乏空间分辨率，因此无法明确鉴定出来。
The solar chromosphere hosts a wide variety of transients, including dynamic fibrils (DFs) that are characterised as elongated, jet-like features seen in active regions, often through H$α$ diagnostics. So far, these features have been difficult to identify in coronal images primarily due to their small size and the lower spatial resolution of the current EUV imagers. Here we present the first unambiguous signatures of DFs in coronal EUV data using high-resolution images from the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter. Using the data acquired with the 174~Å High Resolution Imager (HRI$_{EUV}$) of EUI, we find many bright dot-like features (of size 0.3-0.5 Mm) that move up and down (often repeatedly) in the core of an active region. In a space-time map, these features produce parabolic tracks akin to the chromospheric observations of DFs. Properties such as their speeds (14 km~s$^{-1}$), lifetime (332~s), deceleration (82 m~s$^{-2}$) and lengths (1293~km) are also reminiscent of the chromospheric DFs. The EUI data strongly suggest that these EUV bright dots are basically the hot tips (of the cooler chromospheric DFs) that could not be identified unambiguously before because of a lack of spatial resolution.
