Source Mechanisms of Plasma Waves in the Magnetosphere

磁层等离子体波的来源机制

• 批准号: 8701139
• 负责人: David Murcray
• 金额: $ 8.5万
• 依托单位: University of Denver
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-15 至 1990-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8701139&HistoricalAwards=false
• 关键词: Source; Mechanisms; Plasma; Waves; Magnetosphere

This grant supports a study of internal energy sources of the plasma waves in the space plasma (the magnetospheres of the earth and other planets) by using analytical and numerical methods. The theoretical models will be developed to incorporate realistic features of space plasma including inhomogeneities in density and temperature, anisotropy of the temperature, finite beta and larmor radius effects. The detailed study of the internal energy sources of gradients, particle beams and nonlinear parametric processes will be carried out. Appropriate dispersion relations will be derived and numerically analyzed to obtain wave frequency, growth rates and threshold limits. The model generated wave parameters will be compared with the observations. The importance of geophysical low frequency waves is the interpretation of geomagnetic pulsations (micropulsations) as low frequency hydromagnetic waves originating in the magnetosphere. Thus the waves become a tool for the study of the near earth plasma density. Furthermore, the study of the waves provide an opportunity to elucidate basic processes not readily available in the laboratory.

这笔赠款支持使用分析和数值方法研究空间等离子体(地球和其他行星的磁层)中等离子体波的内部能量来源。理论模型将包括空间等离子体的实际特征，包括密度和温度的不均匀性，温度的各向异性，有限的贝塔和拉莫半径效应。将对梯度、粒子束和非线性参数过程的内部能源进行详细的研究。适当的频散关系将被推导和数值分析，以获得波的频率、增长率和阈值。将模型生成的波浪参数与观测值进行比较。地球物理低频波的重要性在于将地磁脉动(微脉动)解释为源自磁层的低频流体磁波。因此波成为研究近地等离子体密度的一种工具。此外，对波的研究提供了一个机会来阐明实验室中不容易获得的基本过程。