SHINE: Self-Consistent Turbulent Magnetic Reconnection in the Solar Corona

SHINE：日冕中的自洽湍流磁重联

• 批准号: 0962477
• 负责人: Chung-Sang Ng
• 金额: $ 38.37万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0962477&HistoricalAwards=false
• 关键词: SHINE; Self; Consistent; Turbulent; Magnetic

The Principal Investigator (PI) will study the process of turbulent magnetic reconnection through the use of large-scale numerical simulations of magnetohydrodynamic (MHD) models in regimes relevant to the solar corona. Specifically, this research team will investigate how random magnetic field footpoint motions on the Sun produce instabilities, large-scale fluid motions, Alfvén waves, and turbulence; determine how the magnetic reconnection rate correlates with the level of self-consistently produced MHD turbulence; and obtain the overall Lundquist number scaling of the reconnection time-scale and energy dissipation rate. The researchers will also study the process that generates Alfvén wave turbulence dynamically, instead of imposing turbulence externally. This problem of magnetic reconnection and turbulence is highly relevant to solar research. The science results obtained from this project will increase our understanding of many fundamental phenomena in solar physics, such as coronal heating, solar flares, and coronal mass ejections. The process of magnetic reconnection not only applies to the physics of the solar corona and heliosphere, but is also fundamental in many different physical systems, such as planetary magnetospheres, astrophysical accretion disks, and fusion experiments. This project will fully support a graduate student and provide partial support for a Post Doctoral Research Fellow. The PI plans to actively participate in education and outreach activities in the University of Alaska Fairbanks (UAF) community, such as those organized through the 'Public Information and Education Outreach Office' of UAF's Geophysical Institute, as well as those coordinated by UAF's 'Science Education Outreach Network.' The PI will also teach university courses in plasma and space physics at UAF. The simulation codes developed in this project will be made available to the scientific community.

首席研究员（PI）将通过在与太阳日冕相关的区域中使用磁流体动力学（MHD）模型的大规模数值模拟来研究湍流磁重联的过程。具体来说，这个研究小组将研究太阳上的随机磁场脚点运动如何产生不稳定性、大规模流体运动、阿尔夫萨芬波和湍流；确定磁重联率与自洽产生的MHD湍流水平之间的关系；得到重连时间尺度和能量耗散率的整体伦德奎斯特数标度。研究人员还将研究动态产生alfvsamn波湍流的过程，而不是从外部施加湍流。磁重联和湍流问题与太阳研究密切相关。该项目获得的科学成果将增加我们对日冕加热、太阳耀斑和日冕物质抛射等许多太阳物理基本现象的认识。磁重联过程不仅适用于日冕和日球层的物理学，而且在许多不同的物理系统中也是基础的，例如行星磁层、天体物理吸积盘和聚变实验。该项目将全额资助一名研究生，部分资助一名博士后研究员。PI计划积极参与阿拉斯加费尔班克斯大学（UAF）社区的教育和推广活动，例如通过UAF地球物理研究所的“公共信息和教育推广办公室”组织的活动，以及由UAF的“科学教育推广网络”协调的活动。PI还将在UAF教授等离子体和空间物理的大学课程。在这个项目中开发的模拟代码将提供给科学界。