Studies of Magnetohydrodynamic Turbulence and Turbulence in the Interplanetary Medium

这项资助的重点是等离子体湍流在 磁流体动力学（MHD）模型，强调的影响 用于空间等离子体和科学技术研究。 一个主要的持续目标是 基本动力学的识别和表征 MHD湍流的过程。 关于不可压缩的先前结果 湍流松弛过程，如选择性衰变和 动态对准将扩展到三维， 广义到适度可压缩磁流体。 进一步 湍流重联和湍流研究及应用 将追求由大尺度速度剪切驱动的。 这些 湍流理论研究包括分析研究和 广泛的直接数值模拟。 的研究与开发 可压缩湍流模拟的数值算法， 也进行。 第二个重点领域是研究 在MHD尺度的行星际介质中的湍流，包括 与基础理论高度互动， 与观测数据的比较。 主要事业 行星际研究包括进一步发展 结果几乎不可压缩MHD理论，完成和 理论分析模型的数值实现， 分析模型的完善和数值实现 行星际湍流的演变，包括 局部湍流与大尺度梯度的耦合，以及 近离子耗散机制的进一步研究 太阳风等离子体中的陀螺仪 第三个与之密切相关的 研究的领域包括MHD湍流对带电粒子的影响， 粒子加速和散射，特别是由于诱导 电场 总体目标是了解磁流体动力学过程 也就是行星间的“天气” //

This grant focuses on plasma turbulence in the magnetohydrodynamic (MHD) model, with an emphasis on implications for space plasmas and S/T research. A major continuing goal is the identification and characterization of basic dynamical processes in MHD turbulence. Prior results on incompressible turbulent relaxation processes such as selective decay and dynamic alignment will be extended to three dimensions and generalized to moderately compressible magnetofluids. Further study and application of turbulent reconnection and turbulence driven by large scale velocity shear will be pursued. These turbulence theory studies involve both analytical studies and extensive direct numerical simulations. Study and development of numerical algorithms for compressible turbulence simulations is also undertaken. A second major area of emphasis is the study of turbulence in the interplanetary medium at MHD scales, involving a high degree of interplay with the basic theory and extensive comparisons with observational data. Major undertakings in interplanetary studies include further development of the consequences of nearly incompressible MHD theory, completion and numerical implementation of an analytical model for theory, completion and numerical implementation of an analytical model for the evolution of interplanetary turbulence, including couplings of the local turbulence to large scale gradients, and the further study of dissipation mechanisms acting near ion gyroscales in the solar wind plasma. A third and closely related area of study involves the effects of MHD turbulence on charged particle acceleration and scattering, especially due to induced electric fields. The overall aim is to understand MHD processes and hence interplanetary 'weather'. //