论文标题
评估太阳耀斑中色球辐射损失的不同食谱
Evaluation of different recipes for chromospheric radiative losses in solar flares
论文作者
论文摘要
语境。辐射损失是耀斑数值模拟中必不可少的部分。详细的计算在计算上可能很昂贵，尤其是在染色体中。耀斑中有一些近似的食谱，用于耀斑中的辐射损失，但是它们在耀斑模拟中的可行性需要进一步评估。 目标。我们旨在评估耀斑模拟中不同食谱的性能的性能。 方法。我们比较了大气结构和线剖面的横梁加热耀斑，这些耀斑用详细的辐射损失和大约食谱计算出来。 结果。 GF90和HCD22食谱都与详细信息相比提供可接受的总辐射损失，但是在不同的进化阶段，不同大气层的差异在不同的大气层中存在差异，从而导致温度和线强度的误解。当温度超过10^5 K时，GF90的配方高估了上染色体上的冷却，这也会影响耀斑的演化和线不对称。中部染色体中的辐射加热仅在初始阶段起作用，并且可以安全地忽略。但是，来自Lyman Continuum的辐射加热可能在过渡区域附近占主导地位。
Context. Radiative losses are an indispensable part in the numerical simulation of flares. Detailed calculations could be computationally expensive, especially in the chromosphere. There have been some approximate recipes for chromospheric radiative losses in flares, yet their feasibility in flare simulations needs further evaluation. Aims. We aim to evaluate the performance of different recipes for chromospheric radiative losses in flare simulations. Methods. We compare the atmospheric structure and line profiles in beam-heated flares calculated with detailed radiative losses and the approximate recipes. Results. Both GF90 and HCD22 recipes provide acceptable total radiative losses compared with detailed one, but there are discrepancies in the different atmospheric layers during the different evolutionary phases, which leads to misestimations of temperature and line intensity. The recipe of GF90 overestimates the coolings in the upper chromosphere greatly when temperature exceeds 10^5 K, which also affects the flare evolution and line asymmetries. Radiative heating in the middle chromosphere only functions in the initial stage and could be safely neglected. However, radiative heating from Lyman continuum could dominate near the transition region.
