Collaborative Research: Electron Acceleration and Emissions from the Solar Flare Termination Shock

合作研究：太阳耀斑终止激波的电子加速和发射

• 批准号: 1735405
• 负责人: Bin Chen
• 金额: $ 16.88万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1735405&HistoricalAwards=false
• 关键词: Collaborative; Research; Electron; Acceleration; Emissions

This collaborative research project plans to make significant progress toward our understanding of one of the key problems in solar physics; i.e., the question of how electrons are accelerated within solar flares. Solar flares are the strongest explosions in the Solar System, and they provide sites for particle acceleration and high-energy emission. However, the question of exactly how this acceleration occurs remains unsolved. The project will combine two powerful numerical models that will enable the principal investigators (PIs) to simulate the physics over a wide range of scales from the large scale flares that produce shock waves down to the smallest scales where the particle acceleration occurs. This project will also support the training of the next generation of solar scientists. The PIs will involve both undergraduate and graduate students in the research, and funding is provided for a postdoctoral researcher for the project.In solar flares, a termination shock can develop when a high-speed outflow from the flare encounters magnetic loops in the solar atmosphere forming a standing shock wave that can accelerate particles to high energies. These shock waves had been predicted but never observed until recent X-ray and radio observations by one of the PIs (Chen). Motivated by this recent discovery, this project plans to investigate the dynamical evolution of termination shocks and their acceleration of electrons by combining, for the first time, two powerful numerical simulations: (1) large-scale magnetohydrodynamic (MHD) models of the dynamical evolution of a flare and (2) particle-in-cell kinetic and test-particle simulations for electron acceleration at the shock front. From the combined numerical model the PIs plan to generate synthetic hard X-ray emission and compare this emission with observations.

这个合作研究项目计划在我们理解太阳物理学中的一个关键问题上取得重大进展，即电子在太阳耀斑中如何加速的问题。太阳耀斑是太阳系中最强烈的爆炸，它们为粒子加速和高能发射提供了场所。然而，这种加速究竟是如何发生的问题仍然没有解决。该项目将结合两个强大的数值模型，使首席研究人员(PI)能够在从产生冲击波的大尺度耀斑到发生粒子加速的最小尺度的大范围内模拟物理。该项目还将支持对下一代太阳能科学家的培训。PIS将包括本科生和研究生参与研究，并为该项目的一名博士后研究员提供资金。在太阳耀斑中，当耀斑的高速外流与太阳大气中的磁环相遇时，可能会产生终止激波，形成驻留冲击波，从而将粒子加速到高能。这些冲击波已经被预测到了，但直到最近由其中一名PI(Chen)进行的X射线和无线电观测才被观测到。在这一最新发现的推动下，该项目计划通过首次结合两个强大的数值模拟来研究电子终止激波及其加速的动态演化：(1)耀斑动态演化的大尺度磁流体(MHD)模型和(2)激波前沿电子加速的胞内粒子动力学和测试粒子模拟。根据组合的数值模式，PI计划产生合成硬X射线发射，并将该发射与观测值进行比较。

项目成果

Microwave and Hard X-Ray Observations of the 2017 September 10 Solar Limb Flare

• DOI: 10.3847/1538-4357/aad0ef
• 发表时间: 2018-08-10
• 期刊: ASTROPHYSICAL JOURNAL
• 影响因子: 4.9
• 作者: Gary, Dale E.;Chen, Bin;Yu, Sijie
• 通讯作者: Yu, Sijie

The Dynamical Behavior of Reconnection-driven Termination Shocks in Solar Flares: Magnetohydrodynamic Simulations

太阳耀斑中重新连接驱动的终止激波的动力学行为：磁流体动力学模拟

• DOI: 10.3847/1538-4357/aaeed3
• 发表时间: 2018-12
• 期刊: Astrophysical Journal
• 影响因子: 4.9
• 作者: Shen Chengcai;Kong Xiangliang;Guo Fan;Raymond John C.;Chen Bin
• 通讯作者: Chen Bin

Radio Spectroscopic Imaging of a Solar Flare Termination Shock: Split-band Feature as Evidence for Shock Compression

• DOI: 10.3847/1538-4357/ab3c58
• 发表时间: 2019-08
• 期刊: The Astrophysical Journal
• 作者: B. Chen 陈;Chengcai 彩 Shen 沈呈;K. Reeves;F. Guo 郭;Sijie 捷 Yu 余思

Measurement of magnetic field and relativistic electrons along a solar flare current sheet

沿着太阳耀斑电流片测量磁场和相对论电子

• DOI: 10.1038/s41550-020-1147-7
• 发表时间: 2020-07-27
• 期刊: NATURE ASTRONOMY
• 影响因子: 14.1
• 作者: Chen, Bin;Shen, Chengcai;Kong, Xiangliang
• 通讯作者: Kong, Xiangliang

Radio Spectral Imaging of an M8.4 Eruptive Solar Flare: Possible Evidence of a Termination Shock

• DOI: 10.3847/1538-4357/abe5a4
• 发表时间: 2021-04-01
• 期刊: ASTROPHYSICAL JOURNAL
• 影响因子: 4.9
• 作者: Luo，Yingjie;Chen，Bin;Krucker，Sam
• 通讯作者: Krucker，Sam