【摘要】 本文对氢和钙进行了辐射转移方程和统计平衡方程联立求解的非局部热动平衡计算.基于对一系列耀斑大气模型的计算结果,从理论上探讨了微观湍动、极小区和过渡区等对CaIIK线轮廓的影响,并具体地构造了一个耀斑半经验模型。更多还原

【Abstract】 Non-LTE calculations for hydrogen and calcium have been carried out for a series of flare atmosphere models. The equations of radiative transfer and of statistic equilibrium, coupled with the equations of hydrostatic equilibrium and of particle conservation, have been solved iteratively. A model hydrogen atom with four levels plus continuum and a model calcium atom with five levels plus continuum are assumed. The influence of the transition region, temperature minimum region and microturbulence distribution on CaIIK line profile is investigated. The main conclnsion are as follows: (1) In the flare atmosphere, the microturbulent velocity should not be greater than 10 km/s generally, otherwise the computed intensity of CaIIK line is too weak to match the observation. (2) The characteristic of K1 is formed in the layer of temperature minimum region. The distance of K1 from the line center and its intensity can well reflect the position and the temperature of the layer of temperature minimum respectively (as shown in Fig. 6 and Fig. 7). (3) The central intensity of CaIIK line is mainly determined by the transition region mass column density. Using these results, as a first test, we constructed a semiempirical post-flare model, which can reproduce Hα and CaIIK line observations very well.更多还原