GEM: The Role of O+ on Onset and Energy Release in the Earth's Magnetotail

GEM：O 在地球磁尾的起始和能量释放中的作用

• 批准号: 1602748
• 负责人: Christopher Mouikis
• 金额: $ 42.96万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-09-15 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1602748&HistoricalAwards=false
• 关键词: GEM; Role; O+; Onset; Energy

This project addresses compelling questions about the effects of oxygen ions on magnetic reconnection and on the dynamics of Earth's near space environment. Magnetic reconnection is, in effect, the breaking and reconnecting of magnetic field lines with an accompanying explosive release of energy. This energy powers space weather disturbances and contributes in essential ways to the dynamics of the space environment surrounding Earth. The methodology is to combine satellite observations with linked models that in combination are capable of examining the effects of oxygen ions on reconnection in micro scale regions while representing the larger-scale behavior of the Earth's magnetosphere that results. The project has significant broader impacts. In addition to training a graduate student and helping to build the scientific workforce, the investigators plan on participating in a program at the University of New Hampshire that provides research experiences to high school students. The investigation contributes to knowledge of reconnection, which is a universal process and of interest to other scientific fields, such as astrophysics and laboratory plasma physics. Understanding of how mass coupling between the ionosphere and magnetosphere affects reconnection and global system dynamics is essential to building an understanding and predictive capability for space weather, a national priority.Knowledge of the effects of ion composition on the near-Earth space environment is a critical component of models that simulate the response of the magnetosphere to explosive events on the Sun. These oxygen ions originate in the Earth's upper atmosphere. They gain energy during the solar wind interaction with the magnetosphere and flow outward to populate near-Earth space. Their presence alters the mass density of magnetospheric plasma, the environment for the generation of plasma waves, the convection speed of magnetic field lines, the plasma pressure and the thresholds for plasma instabilities. Evidence suggests that the presence of oxygen ions, through their effects on magnetic reconnection and related dynamical processes, can modulate the interaction between the solar wind and magnetosphere as well as the release of energy in the magnetotail, both major factors in the development of space weather disturbances.

该项目解决了关于氧离子对磁重联和地球近空间环境动力学的影响的引人注目的问题。 实际上，磁场重联是磁力线的断裂和重新连接，伴随着能量的爆炸性释放。 这种能量为空间天气扰动提供动力，并以重要方式对地球周围空间环境的动态作出贡献。该方法是将联合收割机卫星观测与相关模型相结合，这些模型能够检查氧离子对微尺度区域重连的影响，同时代表由此产生的地球磁层的大尺度行为。该项目具有更广泛的影响。 除了培训研究生和帮助建立科学劳动力，研究人员计划参加新罕布什尔州大学的一个项目，为高中生提供研究经验。 该研究有助于了解重连，这是一个普遍的过程，并对其他科学领域，如天体物理学和实验室等离子体物理学感兴趣。 了解电离层和磁层之间的质量耦合如何影响重连和全球系统动态，对于建立对空间气象的了解和预测能力至关重要，这是一个国家优先事项，了解离子组成对近地空间环境的影响是模拟磁层对太阳爆炸事件的反应的模型的一个关键组成部分。 这些氧离子起源于地球的高层大气。 它们在太阳风与磁层相互作用期间获得能量，并向外流动，以填充近地空间。 它们的存在改变了磁层等离子体的质量密度、等离子体波产生的环境、磁力线的对流速度、等离子体压力和等离子体不稳定性的阈值。 有证据表明，氧离子的存在通过其对磁重联和相关动力学过程的影响，可以调节太阳风与磁层之间的相互作用以及磁尾中能量的释放，这两个因素都是空间天气扰动发展的主要因素。