An Investigation of Discontinuities in the Solar Terrestrial Environment

日地环境不连续性的调查

• 批准号: 8702643
• 负责人: Charles Goodrich
• 金额: $ 5万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-15 至 1990-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8702643&HistoricalAwards=false
• 关键词: Investigation; Discontinuities; Solar; Terrestrial; Environment

This grant will support a theoretical study of tangential and rotational discontinuities in collisionless plasma by means of computer simulations. Such discontinuities are common and important structures in the solar terrestrial environment. A key example is the earth's magnetopause, the boundary between the terrestrial and solar magnetic fields. The simulations will be performed using one and two dimensional hybrid codes which incorporate ion kinetic effects such as viscosity. The simulation results will be used to obtain one and two dimensional models of the equilibrium structure of these discontinuities. The stability of the models, which will include the possibility of plasma velocity shear, will be examined. The results will have implications for plasma diffusion, heating, and acceleration at the magnetopause and discontinuities in the solar wind. Throughout this study in situ observations will be used to constrain the models. The importance of this work in S/T relations concerns the energy flow form the solar wind to the magnetosphere. the magnetopause transition is clearly important to this process which in effect powers much of the magnetosphere's activity e.g. substorms and aurora.

这笔赠款将支持切向的理论研究 和无碰撞等离子体中的旋转间断， 计算机模拟。 这种不连续性是常见的， 太阳系地球环境中的重要结构。 一个关键 例如，地球的磁层顶， 地球和太阳磁场。 模拟将是 使用一维和二维混合码执行， 并结合离子动力学效应如粘度。 的 模拟结果将用于获得一维和二维 这些不连续性的平衡结构的模型。 模型的稳定性，其中包括可能性 等离子体速度剪切，将被检查。 结果将 对等离子体的扩散、加热和加速都有影响 在磁层顶和太阳风的不连续性。 在整个研究过程中，将使用现场观察， 约束模型。 这项工作在科技关系中的重要性关系到 能量从太阳风流向磁层。 的 磁层顶跃迁对这一过程显然很重要 这实际上为磁层的大部分活动提供了动力，例如 亚暴和极光