First high-resolution studies of photospheric bright points as heating drivers: early DKIST science

首次对光球亮点作为加热驱动因素的高分辨率研究：早期 DKIST 科学

• 批准号: 2308075
• 负责人: Samuel Van Kooten
• 金额: $ 33.5万
• 依托单位: Southwest Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2308075&HistoricalAwards=false
• 关键词: First; resolution; studies; photospheric; bright

This project seeks to address the coronal heating problem – the phenomena in which the Sun’s atmosphere increases in temperature as one moves away from the surface of the Sun. In this study, observations with NSF’s Daniel K. Inouye Solar Telescope of photospheric bright points, which are the smallest and short-lived features on the Sun and appear in regions of strong magnetic field, will be compared with simulations. The broader impacts of this study include understanding of the solar atmosphere, in which the Earth and all planets exist, and it supports an early career scientist as project lead. Specifically, this project will identify and track photospheric bright points, which will be used to constrain several models of coronal heating. A recently developed technique to connect bright-point shape changes to individual wave modes will be used compute corresponding energy fluxes, providing insights into driving of wave-modes, which could carry energy to the corona. The number density and motions of bright points at a level of detail previously impossible, and the degree of bright-point rotation will be measured, enabling more realistic simulations of nanoflare-driven heating. Distributions and correlations of properties, particularly those relating to the shapes of bright points and of the corresponding magnetic flux enhancements, will be measured, enhancing understanding of bright-point properties on the smallest scales. Finally, the team will carry out computer simulations, which will extend previous work on bright points and enhance our understanding of wave-driving.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.

该项目旨在解决日冕加热问题-即太阳大气层温度随着远离太阳表面而升高的现象。在这项研究中，观察与美国国家科学基金会的丹尼尔K。将把Inouye太阳望远镜观测到的光球亮点与模拟进行比较，光球亮点是太阳上最小和寿命短的特征，出现在强磁场区域。这项研究的更广泛的影响包括了解太阳大气层，地球和所有行星都存在于其中，它支持早期职业科学家作为项目负责人。具体而言，该项目将确定和跟踪光球亮点，这将用于限制日冕加热的几个模型。最近开发的一种将亮点形状变化与单个波模式联系起来的技术将用于计算相应的能量通量，从而深入了解波模式的驱动，这些波模式可以将能量带到日冕。亮点的数量密度和运动在以前不可能的细节水平上，以及亮点旋转的程度将被测量，从而能够更真实地模拟纳米火焰驱动的加热。将测量特性的分布和相关性，特别是与亮点的形状和相应的磁通量增强有关的特性，从而增强对最小尺度上的亮点特性的理解。最后，该团队将进行计算机模拟，这将扩展以前的亮点工作，并提高我们对波浪驱动的理解。该奖项反映了NSF的法定使命，并已被认为是值得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的支持。