SHINE: Collaborative Research: Time-dependent coupling of the solar corona and inner heliosphere: Interfacing LFM-helio with MAS

该提案寻求资金，用于开发和验证一种新的复杂的数值模型，该模型将通过与周围太阳风的相互作用，跟踪日冕物质抛射(CME)在日冕中的诞生，直至1 AU。最终的模型将结合两个已建立的、公认的程序，“MAS”(围绕球体的MHD)，将太阳日冕模拟到大约30个太阳半径，以及“LFM Helio”，这是最初为磁层模拟开发的LFM程序的改编，将跟踪传播到1AU。要完成的具体任务包括：1)稳态MAS/LFM-HELIO耦合，以获得日冕和内日光层的环境太阳风配置；2)随时间变化的耦合，使日冕和内日光层区域之间的界面能够无缝传播CME结构；3)通过日冕-内日光层模拟对产生的耦合模型进行检验，调查CME与周围太阳风和彼此的相互作用，并与日球层成像进行比较。如果一个主要的CME要撞击地球，它可能对从GPS卫星到地面电网的一切都产生重大影响。因此，了解日冕物质抛射如何从太阳传播到地球可能是空间天气预报最重要的方面。一名女博士生将在这个项目下接受培训。

This proposal seeks funding for the development and validation of a new sophisticated numerical model that would follow Coronal Mass Ejections (CMEs) from their birth in the solar corona, through interactions with the ambient solar wind, and out to 1 AU. The finished model will combine two established, well-recognized codes, "MAS" (MHD Around a Sphere) to model the solar corona out to about 30 solar radii and "LFM Helio," an adaptation of the LFM code originally developed for magnetospheric simulations, that would follow the propagation out to 1 AU. Specific tasks to be completed include: 1) Steady-state MAS/LFM-helio coupling to obtain the ambient solar wind configuration throughout the corona and inner heliosphere prior to CME initiation; 2) Time-dependent coupling allowing seamless propagation of the CME structure through the interface between the coronal and inner heliosphere domains located at ∼ 30 RE; 3) Vetting of the resultant coupled model by performing corona-inner heliosphere simulations, investigations of CME interaction with the ambient solar wind and each other, and comparisons with heliospheric imaging.If a major CME was to hit the earth it could have major consequences on everything from GPS satellites to the terrestrial power grid. Hence, understanding how CMEs propagate from the Sun to the Earth is perhaps the most important aspect of space weather forecasting. A female PhD student would be trained under this project.