arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.08850astro-ph.SR
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太阳白光耀斑光谱特征的辐射流体动力学模拟

Radiative Hydrodynamic Simulations of the Spectral Characteristics of Solar White-light Flares

Yu-Tong Yang, Jie Hong, Ying Li, Ming-De Ding, Hui Li

摘要:

作为太阳大气中最剧烈的活动之一,白光耀斑(WLF)通常以其增强的白光(或连续光)发射而闻名,其主要起源于太阳低层大气。然而,我们对白光发射是如何产生的知之甚少。在这项研究中,我们的目标是调查的连续在3600 ℃和4250 ℃的响应,以及H $α$和Ly $α$线在WLF模拟与辐射流体力学模拟。我们采用非热电子束作为两种不同初始大气中的WLF的能量源,并改变它们的参数。我们的结果表明,非热电子束加热的模型可以清楚地显示在3600 ℃和4250 ℃以及在H $α$和Ly $α$线的连续增强。较大的电子束通量、较小的谱指数或半影初始大气导致3600 nm、4250 nm和H $α$谱线上较强的发射增加。然而,对于Ly $α$线,它更优选地在具有较大的电子束光谱指数的安静太阳初始大气中增强。还值得注意的是,在3600 ° C和4250 ° C的连续谱和H $α$线在加热开始时表现出变暗,并且在加热函数的峰值时间之后达到其峰值发射,而Ly $α$线没有表现出这样的行为。这些结果可作为分析未来WLF观测的参考。

英文摘要:

As one of the most violent activities in the solar atmosphere, white-light flares (WLFs) are generally known for their enhanced white-light (or continuum) emission, which primarily originates in the solar lower atmosphere. However, we know little about how white-light emission is produced. In this study, we aim to investigate the response of the continua at 3600Å and 4250Å and also the H$α$ and Ly$α$ lines during WLFs modeled with radiative hydrodynamics simulations. We take non-thermal electron beams as the energy source for the WLFs in two different initial atmospheres and vary their parameters. Our results show that the model with non-thermal electron beam heating can clearly show enhancements in the continua at 3600Å and 4250Å as well as in the H$α$ and Ly$α$ lines. A larger electron beam flux, a smaller spectral index, or a penumbral initial atmosphere leads to a stronger emission increase at 3600Å, 4250Å and in the H$α$ line. For the Ly$α$ line, however, it is more preferably enhanced in a quiet-Sun initial atmosphere with a larger spectral index of the electron beam. It is also notable that the continua at 3600Å and 4250Å and the H$α$ line exhibit a dimming at the beginning of the heating and reach their peak emissions later than the peak time of the heating function, while the Ly$α$ line does not show such behaviors. These results can be served as a reference for analyzing future WLF observations.

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