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; 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.

该协作研究项目计划在理解太阳能物理学的关键问题之一方面取得重大进展。即，在太阳耀斑内如何加速电子的问题。 太阳耀斑是太阳系中最强的爆炸，它们为颗粒加速和高能发射提供了位置。 但是，这种加速度如何确切的问题仍未解决。 该项目将结合两个强大的数值模型，这些模型将使主要研究人员（PIS）从大型耀斑的广泛尺度上模拟物理，从而产生冲击波到粒子加速的最小尺度。 该项目还将支持下一代太阳能科学家的培训。 PIS将涉及本科生和研究生参与研究，并为该项目的博士后研究人员提供资金。在太阳能弹性中，当从耀斑遇到太阳能大气中的高速流出磁性回路的高速流出时，可能会产生终止冲击，形成高速震荡，从而加速了高能颗粒。 这些冲击波已经被预测，但直到最近的X射线和无线电观察到PIS（Chen），从未观察到。 由于最近的发现，该项目计划通过首次将两个强大的数值模拟结合起来，研究终止冲击的动态演变及其对电子的加速性演变：（1）大规模的磁性水力动力学（MHD）模型的动力学演化，并在电池中进行粒子粒子粒子kinetic和test-test-PARTSICES，以换取电子粒子式的图解。 从组合的数值模型中，PIS计划生成合成硬X射线发射，并将该发射与观测值进行比较。