SunRISE - Application of Spectral Synthesis to the Study of Solar Visible, UV, EUV and Infrared Variability

SunRISE - 光谱合成在太阳可见光、紫外、EUV 和红外变化研究中的应用

• 批准号: 0209480
• 负责人: Peter Fox
• 金额: $ 24万
• 依托单位: University Corporation For Atmospheric Res
• 依托单位国家: 美国
• 项目类别: Cooperative Agreement
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-05-15 至 2005-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0209480&HistoricalAwards=false
• 关键词: SunRISE; Application; Spectral; Synthesis; Study

The investigators will work to understand the physical origins of solar radiative variability. The main effort is to utilize semi-empirical models of the solar atmosphere to represent features on the solar surface and, where discrepancies are discovered, redefine the models. The investigators will then determine the effect of the distribution of surface features on irradiance and combine the information with spectral synthesis lines and broad spectral bands so as to compute spectral and total irradiance for a particular state of the Sun. Ultimately, the investigators seek to determine the most efficient measurements to make in the future in order to take advantage of the basic redundancy in the solar spectrum. The aim of the RISE program is to improve physical understanding of present, past, and future radiative output variations in the extreme ultraviolet (EUV), ultraviolet (UV), visible and infrared. In a practical sense, spectrum synthesis gives insight into the reliability of the use of surrogates (also known as proxies) to estimate total and spectral irradiance in the absence of direct measurements of appropriate accuracy. This exploitation of the natural redundancy and coherence in the solar spectrum can lead to more efficient measurement and analysis programs. Previous work of the investigators illustrated the importance of the evolution and spatial distribution of both plage and network (i.e. magnetic flux emergence) in determining the detailed time variability of irradiance. This work also revealed the sensitivity of the continuum intensity variation to structures deeper in the photosphere. The continuing speculation of a link between solar and climate variability on timescales longer than a decade raises the important issue of changes in the color of the solar spectrum due to variability of lines and continuum. An accurate theoretical estimate of the total solar irradiance and the shape of the solar radiation spectrum are essential to climate studies.

研究人员将努力了解太阳辐射变异性的物理起源。主要的努力是利用太阳大气的半经验模型代表太阳表面上的特征，并且在发现差异的地方重新定义了模型。然后，研究人员将确定表面特征分布对辐照度的分布的影响，并将信息与光谱合成线和宽光谱结合在一起，以计算特定的太阳状态的光谱和总辐照度。最终，研究人员试图确定将来要进行的最有效的测量，以利用太阳谱中的基本冗余。崛起计划的目的是提高对极端紫外线（EUV），紫外线（UV），可见和红外线的当前，过去和未来辐射产出变化的物理理解。从实际意义上讲，光谱合成可以洞悉使用替代物（也称为代理）的可靠性，以估计没有适当准确性的直接测量的情况下，以估算总体和光谱辐照度。太阳光谱中自然冗余和连贯性的这种剥削可以导致更有效的测量和分析程序。研究人员的先前工作说明了材料和网络的进化和空间分布的重要性（即磁通量出现）在确定辐照度的详细时间变化中的重要性。这项工作还揭示了连续强度变化对光球更深的结构的敏感性。由于线和连续体的可变性，太阳能上太阳能和气候变化之间的联系的持续猜测增加了太阳光谱颜色变化的重要问题。对总太阳辐照度和太阳辐射谱的形状的准确理论估计对于气候研究至关重要。