Analyses of Observed Magnetic Field Characteristics for the Understanding of Solar Eruptions Physics Using a Data-Driven Three-Dimensional Magnetohydrodynamic (3D MHD) Model

使用数据驱动的三维磁流体动力学 (3D MHD) 模型分析观测到的磁场特征，以了解太阳喷发物理

• 批准号: 0754378
• 负责人: Shi Wu
• 金额: $ 28.77万
• 依托单位: University of Alabama in Huntsville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0754378&HistoricalAwards=false
• 关键词: Analyses; Observed; Magnetic; Field; Characteristics

The Principal Investigator will simulate solar eruptions based on his recently developed 3D MHD solar active region (AR) evolution model, which is driven by actual observations. The new model has already shown promise in reproducing the non-potential magnetic field evolution of an active region AR8100. He will investigate potential triggers for solar eruptive events using available photospheric measurements, in order to determine the factors contributing to the initiation of a solar eruption. Specifically, the PI plans to study issues related to the magnetic configuration and free magnetic energy of active regions; the effects of magnetic flux emergence and submergence/cancellation on solar eruptions; contributions of energy and helicity flux through the photosphere to the growth of ARs; and the energy threshold for solar eruption. He also will perform a correlative study of the evolution of energy/helicity flux and non-potential magnetic field parameters. The most important innovation in the Principal Investigator's new model is the incorporation of actual photospheric measurements. In addition, self-consistent and time-dependent characteristic boundary conditions are fully implemented in the model to correctly input these changing photospheric observations. The PI states that effects caused by sub-photospheric and convective zone dynamics will be directly reflected through the surface boundary conditions, and thus his model will be able to couple the sub-photosphere and the solar corona. A graduate student will be supported in this project. The PI will continue his multiple European collaborations, including a 'US-Slovak Space Weather' initiative, which attracts many foreign scientists and graduate students, some of whom eventually come to work in the US. The 'US-Slovak Space Weather' project has held several annual workshops in Europe and has received the support of the NSF Office of International Science & Engineering (OISE).

首席研究员将基于他最近开发的3D MHD太阳活动区(AR)演化模型来模拟太阳喷发，该模型由实际观测驱动。新模型在重现活动区AR8100的非位势磁场演化方面已经显示出了希望。他将使用现有的光球层测量来调查太阳喷发事件的潜在触发因素，以确定导致太阳喷发的因素。具体地说，国际和平研究所计划研究下列问题：活动区的磁场形态和自由磁能；磁通量浮现和淹没/抵消对太阳喷发的影响；通过光球层的能量和螺旋度通量对太阳喷发的贡献；以及太阳喷发的能量阈值。他还将对能量/螺旋度通量和非位势磁场参数的演变进行相关研究。首席调查员的新模型中最重要的创新是纳入了实际的光球层测量。此外，模式中充分实施了自洽和随时间变化的特征边界条件，以正确输入这些变化的光球层观测数据。PI指出，次光球和对流区动力学造成的影响将通过表面边界条件直接反映出来，因此他的模型将能够耦合次光球和太阳日冕。一个研究生将在这个项目中得到支持。PI将继续他在欧洲的多个合作项目，包括一个名为“美国-斯洛伐克空间天气”的项目，该项目吸引了许多外国科学家和研究生，其中一些人最终来到美国工作。“美国-斯洛伐克空间天气”项目已经在欧洲举办了几次年度研讨会，并得到了美国国家科学基金会国际科学与工程办公室(OISE)的支持。