SHINE: Differential Emission Measure Determination in Three-Dimension (3D) Using Atmospheric Imaging Assembly (AIA) Data

首席研究员(PI)和他的团队将评估和描述新发射的太阳动力学天文台航天器上的大气成像组件(AIA)仪器的一些关键性能指标。解决这些技术问题对于更广泛的科学界对AIA数据的有效解释和分析至关重要。这些问题包括仪器的点扩散函数的反卷积、识别将被排除在未来分析之外的光学厚度视线，以及相关光谱物理的改进以允许解释AIA窄带图像。然后，PI的团队将把这一关于AIA性能的新知识应用于一种名为差分发射测量层析成像(DEMT)的技术，以确定全球日冕的三维结构和热性质。将DEMT重建和最先进的太阳风模型进行比较，可以提高这些模型的真实性，并最终揭示太阳日冕如何被加热以及太阳风如何被激发和加速的长期存在的问题。该项目将使太阳能研究界受益，并发挥重要的教育作用。AIA数据有可能极大地扩展和提高研究界从极端紫外线波长的光谱测量中重建全球日冕热力学配置的能力。此外，这项工作将在密歇根大学进行，在那里它将支持本科生和研究生直接参与研究工作。这项工作的成果将在科学会议上公布，并通过科学出版物向社会广泛传播。

The principal investigator (PI) and his team will assess and characterize a number of key performance metrics of the Atmospheric Imaging Assembly (AIA) instrument on the newly launched Solar Dynamics Observatory spacecraft. Addressing these technical issues is crucial for the effective interpretation and analysis of AIA data by the broader scientific community. These issues include the deconvolution of the instrument's point spread function, the identification of optically thick lines-of-sight to be excluded from future analysis, and the refinement of the relevant spectroscopic physics to allow the interpretation of AIA narrow-band images. The PI's team will then apply this new knowledge of AIA performance to the use of a technique known as differential emission measure tomography (DEMT), in order to determine the three-dimensional structure and thermal properties of the global solar corona. Comparisons between DEMT reconstructions and state-of-the-art solar wind models can improve the realism of these models and, ultimately, shed light on longstanding problems of how the Sun's corona is heated and how the solar wind is energized and accelerated.This project will benefit the solar research community and serve important educational functions. AIA data has the possibility to dramatically extend and improve the research community's ability to reconstruct the thermodynamic configuration of global solar corona from spectroscopic measurements in extreme ultraviolet wavelengths. Also, this work will be performed at the University of Michigan, where it will support direct participation of undergraduate and graduate students in the research effort. The results of this work will be presented at scientific meetings and widely disseminated to the community through scientific publications.