Diagnostics of non-thermal processes in chromospheric flares --- IV. Limb flare spectra for an atmosphere bombarded by an electron beam
Diagnostics of non-thermal processes in chromospheric flares --- IV. Limb flare spectra for an atmosphere bombarded by an electron beam
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色球耀斑非热过程的诊断——IV．
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Ding
中科院分区：
文献类型：
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作者：
C. Fang;J. Hénoux;M. Ding
在考虑电子轰击引起的氢和钙离子的非热碰撞激发和电离的情况下，计算了温度高度分布为半经验模型F1和F2的临边耀斑的Hα、Lyα、Lyβ、CaII K和λ8542等谱线轮廓。与观测结果一致，计算的氢谱线分布非常宽，特别是在源函数达到最大值的高度处。非热效应对于CaII线不太明显。
Hα, Lyα, Lyβ, CaII K andλ8542 Å line profiles have been computed for limb flares with height distributions of temperatures as given by the semi-empirical models F 1 and F2, by including the non-thermal collisional excitation and ionization of hydrogen and of ionized calcium that results from electron bombardment. In agreement with observations, the computed profiles of the hydrogen lines are very broad, especially at the height where the source function reaches its maximum. Non-thermal effects are less pronounced for CaII lines.