论文标题
在耀斑期间对虹膜线进行建模。 I. MG II K线中的蓝翼增强
Modeling the IRIS Lines During a Flare. I. The Blue-Wing Enhancement in the Mg II k Line
论文作者
论文摘要
虹膜MG II K系列是诊断太阳耀斑中加热过程的非常好的工具。最近的研究表明，除了通常的红色不对称之外，这被解释为凝结下流的结果外，该线还可能显示出蓝翼的增强。为了研究这种蓝色的不对称性是如何形成的，我们执行辐射流体动力模拟的网格并计算相应的线轮廓。我们发现，这种光谱特征很可能源自上染色体上的向上等离子体运动。但是，负责蓝翼增强的地层区域可以位于蒸发区域，向上移动的斑点，甚至是向上移动的冷凝区域。我们讨论电子束参数如何影响大气的这些不同动力学。
The IRIS Mg II k line serves as a very good tool to diagnose the heating processes in solar flares. Recent studies have shown that apart from the usual red asymmetries which are interpreted as the result of condensation downflows, this line could also show a blue-wing enhancement. To investigate how such a blue asymmetry is formed, we perform a grid of radiative hydrodynamic simulations and calculate the corresponding line profiles. We find that such a spectral feature is likely to originate from the upward plasma motion in the upper chromosphere. However, the formation region that is responsible for the blue-wing enhancement could be located in an evaporation region, in an upward moving blob, and even an upward moving condensation region. We discuss how the electron beam parameters affect these different dynamics of the atmosphere.
