Non-LTE modelling of prominence fine structures using hydrogen Lyman-line profiles
Non-LTE modelling of prominence fine structures using hydrogen Lyman-line profiles
复制标题
使用氢莱曼线轮廓对突出精细结构进行非 LTE 建模
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
W. Curdt
中科院分区：
文献类型：
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作者：
P. Schwartz;S. Gunár;W. Curdt
目标。我们对2005年5月18日观测到的静止日珥的光谱莱曼线观测进行了详细的统计分析。方法.我们使用了剖面到剖面比较的合成莱曼光谱获得的2D单线日珥精细结构模型作为一个完整的统计分析观察到的莱曼光谱的起点。我们采用2D多线程精细结构模型与随机位置和视线速度的每一个线程，以获得一组统计上显着的合成莱曼线配置文件。我们第一次使用了由不同的线组成的多线模型，并以不同于垂直于磁场的视线角度观察。结果我们研究了2005年5月18日SoHO/SUMER摄谱仪观测到的日珥的等离子体特性，通过比较表征合成和观测到的线轮廓特性的三个统计参数的直方图。这样，积分强度、莱曼衰减比以及中心反转处的强度与峰的平均强度之比提供了对日珥精细结构的柱质量和中心温度的洞察。
Aims. We perform a detailed statistical analysis of the spectral Lyman-line observations of the quiescent prominence observed on May 18, 2005. Methods. We used a profile-to-profile comparison of the synthetic Lyman spectra obtained by 2D single-thread prominence finestructure model as a starting point for a full statistical analysis of the observed Lyman spectra. We employed 2D multi-thread finestructure models with random positions and line-of-sight velocities of each thread to obtain a statistically significant set of synthetic Lyman-line profiles. We used for the first time multi-thread models composed of non-identical threads and viewed at line-of-sight angles different from perpendicular to the magnetic field. Results. We investigated the plasma properties of the prominence observed with the SoHO/SUMER spectrograph on May 18, 2005 by comparing the histograms of three statistical parameters characterizing the properties of the synthetic and observed line profiles. In this way, the integrated intensity, Lyman decrement ratio, and the ratio of intensity at the central reversal to the average intensity of peaks provided insight into the column mass and the central temperature of the prominence fine structures.