Unraveling Solar Wind Variations in the Last Solar Cycle Using Global Magnetohydrodynamic (MHD) Simulations

利用全球磁流体动力学 (MHD) 模拟揭示最后一个太阳周期中太阳风的变化

• 批准号: 2323303
• 负责人: Zhenguang Huang
• 金额: $ 66.02万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 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: 2023-07-15 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2323303&HistoricalAwards=false
• 关键词: Unraveling; Solar; Wind; Variations; Last

Understanding solar wind variations is one of the most important topics in heliophysics. The solar wind is a driver of space weather, which impacts space-based technology. This project will investigate whether Alfven wave turbulence-based models can consistently explain the coronal heating and solar wind acceleration throughout the solar cycle. The Global 3-D numerical model Alfven Wave Solar atmosphere Model (AWSoM) will be used and further developed by incorporating additional physics. The work also supports an early career woman scientist, graduate student, and undergraduate students.This project uses the state-of-the-art physics-based magnetohydrodynamics (MHD) model, AWSoM within the Space Weather Modeling Framework (SWMF) to investigate if the physics within AWSoM is sufficient to explain solar wind variations observed in the last solar cycle. The science objective will be achieved by comparing the simulated solar wind with various in-situ solar wind observations in the last solar cycle. The team will investigate whether the simulated Alfven wave energy densities agree with the observations during different phases of the solar cycle. The Poynting flux and transverse correlation length parameters will be varied and the AWSoM simulated data generated from these runs will be compared to in-situ data at various locations in the heliosphere, as measured by NASA missions.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.

了解太阳风的变化是太阳物理学的重要课题之一。太阳风是空间天气的驱动因素，影响着天基技术。该项目将调查基于阿尔芬波连续性的模型是否能够一致地解释整个太阳周期的日冕加热和太阳风加速。全球三维数值模型阿尔芬波太阳大气模型（AWSoM）将被使用，并通过纳入更多的物理学进一步发展。这项工作还支持了一位早期职业女性科学家，研究生和本科生。该项目使用最先进的基于物理学的磁流体动力学（MHD）模型，AWSoM在空间天气建模框架（SWMF）中调查AWSoM中的物理学是否足以解释在上一个太阳周期中观察到的太阳风变化。科学目标将通过将模拟的太阳风与上一个太阳周期的各种实地太阳风观测结果进行比较来实现。研究小组将调查模拟的阿尔芬波能量密度是否与太阳周期不同阶段的观测结果一致。坡印亭通量和横向相关长度参数将有所不同，从这些运行中产生的AWSoM模拟数据将与在日光层不同位置的原位数据进行比较，如NASA任务所测量的。该奖项反映了NSF的法定使命，并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。