Collaborative Research: Intercomparison of 3D MHD simulations of the solar photosphere and observations: a case study in preparation for the DKIST era

合作研究：太阳光球层 3D MHD 模拟与观测的相互比较：为 DKIST 时代做准备的案例研究

• 批准号: 2148535
• 负责人: Viacheslav Sadykov
• 金额: $ 6.05万
• 依托单位: Georgia State University Research Foundation, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2148535&HistoricalAwards=false
• 关键词: Collaborative; Research; Intercomparison; 3D; MHD

One of the most pressing problems in understanding Earth?s climate is solar irradiance: the amount of light emitted by the Sun. Solar irradiance is the sole source of heating on Earth. If we want to understand our climate, we must understand the source of the sunlight that warms our planet. The proposed work will examine two different high-resolution magnetohydrodynamic models of the Sun in an effort to understand how magnetic variability at small scales (down to tens of kilometers) can affect irradiance. The team will compare the results of the two different models to high-resolution measurements of the Sun from the NSF?s Dunn Solar Telescope and from NASA?s Solar Dynamics Observatory. The result of this work will be a greater understanding of solar irradiance variability, which will lead to a better understanding of the external influences on the Earth?s climate. This work will form the basis of a graduate student?s PhD thesis.The proposed work is to examine the results of two different three-dimensional magnetohydrodynamic simulations of the solar photosphere for solar irradiance at small (~10 km) scales. Simulated spectra will be generated by BAERI?s StellarBox code and from NCAR/HAO?s MURaM code and compared to observations of the Sun from the Dunn Solar Telescope and from the Solar Dynamics Observatory spacecraft. The team will assess the contribution to solar irradiance in certain spectral ranges from magnetic features too small to be resolved in moderate-resolution imaging. They will also examine the effects of different numerical schemes and approximations used in the two different MHD codes to predicted overall irradiance. The overall objective will be to identify the most suitable numerical contributions for advancing irradiance reconstruction and stellar atmosphere models.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

了解地球气候最紧迫的问题之一是太阳辐照度：太阳发出的光量。太阳辐照度是地球上唯一的热量来源。如果我们想了解我们的气候，我们就必须了解使地球变暖的阳光的来源。拟议的工作将研究太阳的两种不同的高分辨率磁流体动力学模型，以了解小尺度（低至数十公里）的磁变化如何影响辐照度。该团队将把两种不同模型的结果与美国国家科学基金会邓恩太阳望远镜和美国宇航局太阳动力学观测站对太阳的高分辨率测量结果进行比较。这项工作的结果将是更好地了解太阳辐照度的变化，从而更好地了解外部对地球气候的影响。这项工作将构成研究生博士论文的基础。拟议的工作是检查太阳光球层在小（约 10 公里）尺度上太阳辐照度的两种不同三维磁流体动力学模拟的结果。模拟光谱将由 BAERI 的 StellarBox 代码和 NCAR/HAO 的 MURaM 代码生成，并与邓恩太阳望远镜和太阳动力学观测站航天器对太阳的观测结果进行比较。该团队将评估某些光谱范围内的磁性特征对太阳辐照度的贡献，这些磁性特征太小而无法在中等分辨率成像中解析。他们还将检查两种不同 MHD 代码中使用的不同数值方案和近似值对预测整体辐照度的影响。总体目标是确定对推进辐照度重建和恒星大气模型最合适的数值贡献。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Can Proton Beam Heating Flare Models Explain Sunquakes?

质子束加热耀斑模型可以解释日震吗？

• DOI: 10.3847/1538-4357/ad0cf3
• 发表时间: 2023
• 期刊: The Astrophysical Journal
• 作者: Sadykov, Viacheslav M.;Stefan, John T.;Kosovichev, Alexander G.;Stejko, Andrey M.;Kowalski, Adam F.;Allred, Joel C.;Kerr, Graham S.
• 通讯作者: Kerr, Graham S.

Compression of Solar Spectroscopic Observations: a Case Study of Mg II k Spectral Line Profiles Observed by NASA's IRIS Satellite

太阳光谱观测数据的压缩：NASA IRIS 卫星观测到的 Mg II k 谱线剖面案例研究

• DOI: 10.1109/cbmi50038.2021.9461879
• 发表时间: 2021
• 期刊: IEEE
• 作者: Sadykov, Viacheslav M;Kitiashvili, Irina N;Dalda, Alberto Sainz;Oria, Vincent;Kosovichev, Alexander G;Illarionov, Egor
• 通讯作者: Illarionov, Egor