日冕EUV辐照度对He I 10830 A和D3多重态辐射的影响
The influence of coronal EUV irradiance on the emission in the He I 10830 A and D3 multiplets
摘要：
He I 10830 A和5876 A（或D3）多重态的谱线是研究太阳色球层和日冕等离子体结构物理性质的两个最有吸引力的光谱窗口，它们的偏振信号对Hanle效应和Zeeman效应敏感。然而，为了能够进行可靠的诊断，至关重要的是要有一个良好的物理理解的灵敏度观察到的谱线辐射的各种竞争的驱动机制。在这里，我们报告了一系列的非肢体非LTE计算的He I D3和10830 A的发射轮廓，集中我们的调查，他们的灵敏度的EUV日冕辐射和模型大气中使用的计算。我们特别表明，蓝色到红色分量的强度比的He I 10830 A多重峰的发射轮廓原来是一个很好的候选人作为诊断工具的日冕辐照度。对这一观测值的测量作为到边缘的距离的函数，以及它与辐射转移建模的对抗，可能会给我们提供关于太阳大气的物理特性和从上面穿透色球层的相关波长的极紫外辐射量的宝贵信息。
英文摘要：
Two of the most attractive spectral windows for spectropolarimetric investigations of the physical properties of the plasma structures in the solar chromosphere and corona are the ones provided by the spectral lines of the He I 10830 A and 5876 A (or D3) multiplets, whose polarization signals are sensitive to the Hanle and Zeeman effects. However, in order to be able to carry out reliable diagnostics, it is crucial to have a good physical understanding of the sensitivity of the observed spectral line radiation to the various competing driving mechanisms. Here we report a series of off-the-limb non-LTE calculations of the He I D3 and 10830 A emission profiles, focusing our investigation on their sensitivity to the EUV coronal irradiation and the model atmosphere used in the calculations. We show in particular that the intensity ratio of the blue to the red components in the emission profiles of the He I 10830 A multiplet turns out to be a good candidate as a diagnostic tool for the coronal irradiance. Measurements of this observable as a function of the distance to the limb and its confrontation with radiative transfer modeling might give us valuable information on the physical properties of the solar atmosphere and on the amount of EUV radiation at relevant wavelengths penetrating the chromosphere from above.
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