Collaborative Research: Numerical Investigation of CME-CME Interaction and Associated Effects from the Low Corona to 1 AU

该研究小组将使用三维磁流体动力学模拟来研究先前太阳爆发和等离子体相互作用过程对到达地球轨道的日冕物质抛射（CME）最终特性的影响。该团队将评估早期的日冕物质抛射如何预处理日光层和太阳风，以及先前的日冕物质抛射相互作用如何偏转、旋转、压缩和加速后续的日冕物质抛射。该团队将确定地球上复杂的日冕物质抛射事件中地缘效应增强的原因，以及通过遥感观测预测这些原因的程度。该团队将使用现有的和改进的日冕物质抛射演化、行星际磁场和太阳风模型对选定的日冕物质抛射事件进行自洽模拟，然后将模型输出与航天器观测结果进行比较。研究人员认为，这些直接比较将更好地限制他们的数值模型，并提供新工具来更好地理解这些复杂的测量结果。该团队是夏威夷大学（牵头机构）、新罕布什尔大学和海军研究实验室的合作成果。团队成员将通过组织和参加研讨会和会议、发表期刊出版物以及增强美国宇航局戈达德太空飞行中心社区协调建模中心的现有社区模型，向空间天气社区广泛传播他们的研究成果。夏威夷大学和新罕布什尔大学的研究人员将让当地本科生参与这项研究。调查人员承诺尽可能招募代表性不足的少数群体参与这项工作。首席研究员还计划利用夏威夷推进系统太阳物理学教育中心进行公众宣传，同时利用这些研究模拟中产生的彩色图形和电影。

This team of investigators will use three-dimensional magnetohyrodynamic simulations to study the impact of prior solar eruptions and plasma interaction processes on the ultimate properties of coronal mass ejections (CMEs) reaching Earth's orbit. The team will assess how earlier CMEs precondition the heliosphere and solar wind, as well as how prior CME interactions deflect, rotate, compress, and accelerate subsequent CMEs. The team will identify the causes of enhanced geo-effectiveness in complex CME events at Earth and the extent to which these causes can be forecasted from remote-sensing observations. The team will conduct self-consistent simulations of selected CME events using existing and improved models of CME evolution, the interplanetary magnetic field, and the solar wind, and they will then compare their model output to spacecraft observations. The investigators argue that these direct comparisons will result in better constraints on their numerical models, as well as in new tools to better understand these complex measurements.The team is a collaborative effort among the University of Hawaii (the lead institution), the University of New Hampshire, and the Naval Research Laboratory. The team members will broadly disseminate their research results to the space weather community by organizing and participating in workshops and conferences, as well as through their journal publications and the enhancement of existing community models at the Community Coordinated Modeling Center at NASA Goddard Space Flight Center. The invesitgators at the University of Hawaii and the University of New Hampshire will integrate local undergraduates in this research. The investigators pledge to recruit under-represented minorities into this effort wherever possible. The lead investigator also plans to take advantage of the Hawaii Center for Advancing Systemic Heliophysics Education for engaging in public outreach, while exploiting the colorful graphics and movies derived from these research simulations.