A. G. M. Pietrow, V. Liakh, C. M. J. Osborne, J. Jenkins, R. Keppens
{"title":"Spectral characteristics of a rotating solar prominence in multiple wavelengths","authors":"A. G. M. Pietrow, V. Liakh, C. M. J. Osborne, J. Jenkins, R. Keppens","doi":"10.1051/0004-6361/202452276","DOIUrl":null,"url":null,"abstract":"We present synthetic spectra corresponding to a 2.5D magnetohydrodynamic simulation of a rotating prominence in the Ca II 8542 Å, H <i>α<i/>, Ca II K, Mg II k, Ly <i>α<i/>, and Ly <i>β<i/> 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 <i>Lightweaver<i/> framework called <i>Promweaver<i/>, 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 <i>α<i/>, and Ly <i>β<i/> lines, even in the presence of complex, turbulent solar atmospheric conditions. However, these signals are barely detectable for the Ca II 8542 Å, H <i>α<i/>, and Ca II K spectral lines. Most notably, we find only a very faint rotational signal in the H <i>α<i/> line, thus reigniting the discussion on the existence of sustained rotation in prominences.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":null,"pages":null},"PeriodicalIF":5.4000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astronomy & Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1051/0004-6361/202452276","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
We present synthetic spectra corresponding to a 2.5D magnetohydrodynamic 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 barely detectable for the Ca II 8542 Å, H α, and 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.
我们在 Ca II 8542 Å 线、H α 线、Ca II K 线、Mg II k 线、Ly α 线和 Ly β 线中展示了一个旋转突出物的 2.5D 磁流体力学模拟合成光谱。在热不稳定性驱动的凝结阶段之前,通量绳内的不对称加热施加了净旋转,而突出部的旋转则是通量绳内角动量守恒的结果。光谱是用一个建立在Lightweaver框架上的名为 "Promweaver "的库创建的,该库提供了边界条件,用于将日盘边缘暗化辐照纳入孤立结构(如突出部)。我们的光谱显示了 Mg II k、Ly α 和 Ly β 线的独特旋转特征,即使在复杂的湍流太阳大气条件下也是如此。然而,在 Ca II 8542 Å、H α 和 Ca II K 光谱线中几乎检测不到这些信号。最值得注意的是,我们只在 H α 线中发现了一个非常微弱的旋转信号,从而再次引发了关于长脉冲存在持续旋转的讨论。
期刊介绍:
Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.