Ca II resonance lines in non-homogeneous chromospheres
Ca II resonance lines in non-homogeneous chromospheres
复制标题
非均匀色球中的 Ca II 共振线
DOI：
10.1007/bf00146157
复制
发表时间：
1969
期刊：
影响因子：
2.8
通讯作者：
H. R. Johnson
中科院分区：
文献类型：
--
作者：
H. A. Beebe;H. R. Johnson
本文计算了双组分太阳色球的K线轮廓，并用简单的几何图形模拟了色球超颗粒网络。每个分量都高于BCA光球，边界分量代表明亮的网络，温度急剧上升，单元分量代表较暗的区域，温度最小值扩大。当μ = 0.6和0.3时，可以得到Can - K岩心的理论强度曲线，该曲线以分量投影面积的加权平均值计算。线源函数和光学深度由稳态和辐射传递方程的自洽处理得到，并假设线内散射完全重新分布。原子模型由两个束缚能级和一个连续体组成。研究发现，只有假设胞区存在非常大的湍流速度时，4600 K的最小值才能成功地对观测到的翼暗和4300 K的K1特征辐射温度进行理论预测。
Profiles of the K line of Caii are computed for a two component solar chromosphere, chosen to simulate with a simple geometry the chromospheric supergranular network. Each component rises above the BCA photosphere, the boundary component representing the bright network with a sharp temperature rise and the cell component representing the darker region with an extended temperature minimum. Theoretical intensity profiles of the Can K core, calculated as weighted averages over the projected areas of the components, are produced for μ = 0.6 and 0.3. The line source function and the optical depth are obtained from a self-consistent treatment of the steady state and radiative transfer equations, with complete redistribution assumed for scattering in the line. The atomic model consists of two bound levels and a continuum. It is found that a 4600 K minimum can lead to the successful theoretical prediction of the observed limb darkening and 4300 K radiation temperature of the K1 feature only when very large values of turbulent velocity are assumed to exist in the cell region.