Title: Study of an active region prominence using spectropolarimetric data in the He I D3 multiplet Show Chinese title

Title: 利用氦 I D3 多重态的光谱偏振数据对活动区日珥的研究

Abstract: Prominences are cool overdensities of plasma supported by magnetic fields that levitate in the solar corona. The physical characterization of these structures is key for understanding the magnetic field in the corona. Our work attempts to shed light on the properties of prominences by using observations at high polarimetric sensitivity in the He I D3 multiplet taken with the Zurich Imaging Polarimeter-3 instrument at the Istituto ricerche solari Aldo e Cele Dacco observatory. We used the HAZEL inversion code to infer the thermodynamic and magnetic properties of an active region prominence, assuming one- and two-component models. Our observations unveil a great diversity of physical conditions in the prominence. The observed Stokes profiles are usually broad and show interesting features, which can be described assuming a two-component model. The contribution of each component and the trends inferred for some parameters vary with the distance to the solar limb. While both components have analogous properties and contribute similarly close to the limb, a major component mainly describes the properties inferred at 10-40 arcsecs away from the limb. Moreover, both components usually show significant differences in thermal broadening, which is essential for ensuring a good fit quality between observations and synthetic profiles. Summarizing, the observed region of the prominence shows line-of-sight velocities of 1-3 km/s and rather horizontal fields of 20-80 gauss. We also report hints of a twist close to a prominence foot and changes in the magnetic configuration at specific locations. Our results indicate a mainly horizontal magnetic field of a few tens of gauss in the prominence. A model of two components with different thermal broadenings and filling factors, depending on the limb distance, is crucial for providing a consistent solution across most of the observed prominence. Show Chinese abstract

Abstract: 暗条是被磁场支撑的等离子体冷高密度区，在太阳日冕中悬浮。这些结构的物理特征对于理解日冕中的磁场至关重要。我们的工作尝试通过使用苏黎世成像偏振计-3仪器在阿尔多和切莱·达科天文台获取的氦I D3多重态的高偏振灵敏度观测数据，来揭示暗条的特性。我们使用HAZEL反演代码，假设一成分和两成分模型，推断出活动区暗条的热力学和磁场特性。我们的观测揭示了暗条中存在很大的物理条件多样性。观测到的斯托克斯轮廓通常较宽，并显示出有趣的特征，这可以通过假设两成分模型来描述。每个成分的贡献以及某些参数的趋势随着距离太阳边缘的距离而变化。虽然两个成分具有类似特性，并在靠近边缘处贡献相似，但主要成分主要描述了距离边缘10-40角秒处推断出的特性。此外，两个成分通常在热展宽方面表现出显著差异，这对于确保观测和合成轮廓之间的良好拟合质量至关重要。总结来说，观测到的暗条区域显示视线速度为1-3公里/秒，且磁场方向较为水平，约为20-80高斯。我们还报告了接近暗条足部的扭转变形以及特定位置磁场配置的变化。我们的结果表明，暗条中的磁场主要是几十大于高斯的水平磁场。一个由不同热展宽和填充因子组成的两成分模型，根据距离边缘的距离而变化，对于在大多数观测到的暗条区域提供一致的解决方案至关重要。