arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2410.03479astro-ph.SR
收藏

旋转太阳日珥在多波段下的光谱特征

Spectral Characteristics of a Rotating Solar Prominence in Multiple Wavelengths

A. G. M. Pietrow, V. Liakh, C. M. J. Osborne, J. Jenkins, R. Keppens

AI总结:

本文基于2.5D磁流体动力学模拟和Promweaver框架生成旋转日珥的多波段合成光谱,发现Mg II k、Ly α和Ly β线具有明显旋转特征,而Hα线信号极弱,重新引发日珥持续旋转存在性的讨论。

摘要:

我们给出了与一个2.5维磁流体动力学模拟相对应的合成光谱,该模拟描述了一个旋转日珥在Ca II 8542 Å、Hα、Ca II K、Mg II k、Ly α和Ly β谱线中的表现。日珥的旋转源于磁通量绳内部的角动量守恒,其中非对称加热在热不稳定性驱动的凝聚阶段之前施加了净旋转。光谱是利用一个基于Lightweaver框架构建的名为Promweaver的库生成的,该库为在日珥等孤立结构上引入太阳圆盘的临边昏暗辐照提供了边界条件。我们的光谱显示,即使在复杂、湍流的太阳大气条件下,Mg II k、Ly α和Ly β谱线仍具有明显的旋转特征。然而,这些信号在Ca II 8542 Å、Hα和Ca II K谱线中几乎无法探测到。最值得注意的是,我们在Hα谱线中只发现了非常微弱的旋转信号,从而重新引发了关于日珥中是否存在持续旋转的讨论。

英文摘要:

We present synthetic spectra corresponding to a 2.5D magnetohydrodynamical simulation of a rotating prominence in the Ca II 8542 Å, H$α$, Ca II K, Mg II k, Ly $α$, and Ly $β$ lines. The prominence rotation resulted from angular momentum conservation within a flux rope where asymmetric heating imposed a net rotation prior to the thermal-instability driven condensation phase. The spectra were created using a library built on the Lightweaver framework called Promweaver, which provides boundary conditions for incorporating the limb-darkened irradiation of the solar disk on isolated structures such as prominences. Our spectra show distinctive rotational signatures for the Mg II k, Ly $α$, and Ly $β$ lines, even in the presence of complex, turbulent solar atmospheric conditions. However, these signals are hardly detectable for the Ca II 8542 Å, H$α$, Ca II K spectral lines. Most notably we find only a very faint rotational signal in the H$α$ line, thus reigniting the discussion on the existence of sustained rotation in prominences.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑