Collaborative Research: Achieving a New Understanding of Solar Flare Termination Shocks

合作研究：对太阳耀斑终止激波有了新的认识

• 批准号: 2108438
• 负责人: Chengcai Shen
• 金额: $ 18.52万
• 依托单位: Smithsonian Institution Astrophysical Observatory
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108438&HistoricalAwards=false
• 关键词: Collaborative; Research; Achieving; New; Understanding

A collaborative project between the New Mexico Consortium, New Jersey Institute of Technology, Dartmouth College, and the Smithsonian Institution Astrophysical Observatory is dedicated to the study of solar flares. Solar flares are a priority science area for the 2019 National Space Weather Strategy and Action Plan. When solar flares impact Earth they effect the near-Earth space radiation environment and contribute to satellite drag. Solar flares contain two parts – light and particles. The bright flaring light, the most popularly noted feature of these events, is followed by a stream of extremely fast electrons and ions. These particles can reach earth within an hour of the light emission, making timely prediction of particle events particularly challenging. This project examines one potential mechanism for the acceleration of particles to such high energies. It combines multiple state of the models and data from satellite and ground-based platforms. The research team is comprised of early-career faculty and students from the four collaborating institutions.This project addresses particle acceleration and transport in solar flares. Specifically, it will address magnetic reconnection driven processes in flare termination shocks and their role in electron acceleration and transport, and non-thermal emission. The modeling effort combines large-scale particle-in-cell and magnetohydrodynamic (MHD) simulations in 2.5D and 3D to model realistic magnetic field and plasma evolution along with the energy release, particle acceleration, and transport. Synthetic observations from the combined simulations will be generated to be compared with microwave, E/UV, and X-ray imaging and spectroscopic data from the Expanded Owens Valley Solar Array, the NASA’s Solar Dynamics Observatory, and Hinode.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.

新墨西哥联盟、新泽西理工学院、达特茅斯学院和史密森学会天体物理天文台的一个合作项目致力于太阳耀斑的研究。太阳耀斑是2019年国家空间天气战略和行动计划的优先科学领域。当太阳耀斑撞击地球时，它们会影响近地空间辐射环境，并造成卫星阻力。太阳耀斑包含两部分--光和粒子。明亮的耀斑光是这些事件最常见的特征，紧随其后的是极快的电子和离子流。这些粒子可以在光发射后一小时内到达地球，这使得及时预测粒子事件特别具有挑战性。这个项目研究了粒子加速到如此高的能量的一种潜在机制。它结合了模型的多种状态以及来自卫星和地面平台的数据。研究团队由来自四个合作机构的早期教师和学生组成。这个项目研究太阳耀斑中的粒子加速和传输。具体地说，它将讨论耀斑终止激波中的磁重联驱动过程及其在电子加速和传输以及非热发射中的作用。建模工作结合了2.5D和3D的大规模粒子单元和磁流体(MHD)模拟，以模拟真实的磁场和等离子体演化以及能量释放、粒子加速和输运。来自组合模拟的综合观测结果将与扩展的欧文斯谷太阳能阵列、NASA太阳动力学天文台和日立德的微波、E/UV和X射线成像和光谱数据进行比较。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势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

Statistical Study of the Kinetic Features of Supra-arcade Downflows Detected from Multiple Solar Flares

• DOI: 10.3847/1538-4357/ac695d
• 发表时间: 2022-06
• 期刊: The Astrophysical Journal
• 作者: Xiaoyan Xie;K. Reeves;Chengcai Shen;Joshua Ingram

Non-thermal broadening of IRIS Fe XXI line caused by turbulent plasma flows in the magnetic reconnection region during solar eruptions

• DOI: 10.3389/fspas.2023.1096133
• 发表时间: 2022-11
• 作者: Chengcai Shen;V. Polito;K. Reeves;Bin Chen;Sijie Yu;Xiao-yang Xie

Nonequilibrium Ionization Modeling of Petschek-type Shocks in Reconnecting Current Sheets in Solar Eruptions

• DOI: 10.3847/1538-4357/aca6e7
• 发表时间: 2022-11
• 期刊: The Astrophysical Journal
• 作者: Chengcai Shen;J. Raymond;N. Murphy