Nonlinear Wave-Particle Interactions in the Magnetosphere and Heliosphere

将利用最近发展的理论见解和数值方法来产生和求解新的数学模型，以解释在磁层和日光层中测量的波的空间和时间分布以及相关的粒子速度分布。重点是使用动力学、流体和混合模型，研究束激发波、波加速粒子和束弛豫的演化。旨在模拟线性和非线性动力学效应的创新的高维两时间尺度流体代码将在NCAR超级计算机上开发和求解，低维版本将针对Vlasov代码进行测试。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，并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杂波结构的现场测量结果进行比较。相关的磁层波和粒子数据将来自阿拉斯加-88火箭、比达卡火箭和阿拉斯加-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·黄玉火箭运动。我们将建立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，在地球弓激波的电子前震和太阳风中发现的束流驱动的朗缪尔波湍流共同的基本基本过程，并假设为旅行者1号和2号测量的日球层发射源。理论预测将与高时间分辨率的数据进行比较，这些数据关于电子前震和预计将于1994年11月发射的风卫星的电子前震和太阳风中的朗缪尔波。

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.