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arXiv 1209.6264astro-ph.SR
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关于巴耳末和莱曼发射线的起源

On the Origin of the Balmer and Lyman Emission Lines

G. Stellmacher, E. Wiehr

摘要:

我们将展示如何观察到的氢巴耳末和莱曼发射线约束静态太阳能光伏建模。我们将莱曼线的空间观测与巴耳末线的地面观测进行比较,以获得由H β发射定义的具有可比亮度的静止日珥。从相应的新兴莱曼和巴耳末线发射推导出的相同的上能级u发射的氢原子的有效数密度显示出很大的差异,随着能级数的增加而减小,并收敛于最高能级数。在u=5时激发的氢原子对莱曼辐射的贡献比相应的巴耳末辐射小250倍,而在u=8时激发的氢原子对莱曼辐射的贡献比相应的巴耳末辐射小65倍,这支持了两个系列的辐射具有不同空间起源的观点。这也由线宽表示。所有Lyman成员的高光学厚度允许从谱线中心的光谱辐射率估计亮度温度T_b,其中T_b被发现在很大程度上与上能级数无关,与Balmer线的(已知的)行为相反。

英文摘要:

We show how the observed hydrogen Balmer and Lyman emission lines constrain the modeling of quiescent solar prominences. We compare space observations of Lyman lines with ground-based observations of Balmer lines for quiescent solar prominences of comparable brightness defined by their H-beta emission. The effective number densities of hydrogen atoms emitting from the same upper level u deduced from the corresponding emerging Lyman and Balmer line emissions show large differences that diminish with increasing level number and converge at the highest level numbers. Hydrogen atoms excited in u=5 contribute 250 times less, and those in u=8 still contribute 65 times less to the Lyman than to the corresponding Balmer emission, supporting the idea of distinct spatial origin of the emissions of both series. This is also indicated by the line widths. The high optical thickness of all Lyman members allows the brightness temperature T_b to be estimated from the spectral radiance at line center, where T_b is found to be largely independent of the upper level number, in contrast to the (known) behavior of the Balmer lines.

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