Nonlinear Wave-Particle Interactions in the Magnetosphere and Heliosphere

磁层和日光层中的非线性波粒相互作用

• 批准号: 9417116
• 负责人: Martin Goldman
• 金额: $ 41.28万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-11-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9417116&HistoricalAwards=false
• 关键词: Nonlinear; Wave; Particle; Interactions; Magnetosphere

Recently-developed theoretical insights and numerical methods will be used to generate and solve new mathematical models for interpreting measured spatial and temporal distributions of waves and associated particle velocity distributions in the magnetosphere and heliosphere. Emphasis will be on the evolution of beam-excited waves, wave-accelerated particles, and beam relaxation, using kinetic, fluid and hybrid models. Innovative higher dimensional two-time-scale fluid codes designed to mimic linear and nonlinear kinetic effects will be developed and solved on the NCAR supercomputers, with lower dimensional versions tested against Vlasov codes. In collaboration with experiments from the Berkeley Space Sciences Laboratory, theoretical models will be constructed and numerically analyzed, and the results compared with in-situ rocket and satellite measurements of electrons, ions, magnetized- electron-plasma waves and lower-hybrid wave structures in the magnetosphere. Relevant magnetospheric wave and particle data will come from the Alaska-88, Bidarca and Alaska-95 rockets, the imminent Fast Explorer and satellite, the Swedish satellite Freja, and the Cornell Topaz rocket campaigns. We will construct and numerically analyze closely related mathematical models, which describe similar fundamental underlying processes common to beam- driven Langmuir wave turbulence found in the electron foreshock of Earth's bow shock and in the solar wind, during solar radio emissions, and postulated as the source of the heliospheric emission measured by Voyager 1 and 2. Theoretical predictions will be compared with high-time resolution data on particle distributions and Langmuir waves in the electron foreshock and in the solar wind expected from the WIND satellite, to be launched in November of 1994.

将利用最近发展的理论见解和数值方法来生成和求解新的数学模型，以解释磁层和日光层中测得的波的空间和时间分布以及相关的粒子速度分布。 重点将放在束激发波，波加速粒子和束松弛的演变，使用动力学，流体和混合模型。 创新的高维双时间尺度流体代码，旨在模拟线性和非线性动力学效应将开发和解决的NCAR超级计算机，与低维版本测试对弗拉索夫代码。 将与伯克利空间科学实验室的实验合作，建立理论模型并进行数值分析，将结果与火箭和卫星对磁层中电子、离子、磁化电子等离子体波和低混杂波结构的现场测量结果进行比较。 有关的磁层波和粒子数据将来自阿拉斯加-88、比达尔卡和阿拉斯加-95火箭、即将发射的快速探索者和卫星、瑞典卫星Freja和康奈尔黄玉火箭活动。 我们将构建和数值分析密切相关的数学模型，这些模型描述了在太阳射电发射期间，在地球弓形激波的电子前震和太阳风中发现的光束驱动的朗缪尔波湍流的相似基本基本过程，并假设为旅行者1号和2号测量的日光层发射源。 将把理论预测与关于电子前震和太阳风中粒子分布和朗缪尔波的高时间分辨率数据进行比较，该卫星预计将于1994年11月发射。