Complexity Induced Bimodal Anisotropic Intermittent Turbulence in Geospace

对研究卫星观测到的地球空间等离子体现象的局部、点观测进行了相当大的观测和理论关注。然而，显然存在涉及全球和多尺度问题的重要问题：磁层、电离层和日地连接区域内的能量和动量传输问题，以及粒子群的性质、其来源、进入、带电、扩散和系统的最终损失等问题。理论模型正被迫面对非局部性和“复杂性”问题。对于涉及电场和磁场涨落的非局域性和复杂性效应的系统来说，非均匀性和反常的各向异性输运和带电过程是重要的。该项目将定量研究地球空间区域的等离子体湍流和间歇性波动。湍流的非传播部分和传播部分的详细光谱和其他随机特性将被确定，并与实验观测进行比较。其目标是生成一幅由复杂性产生的间歇性湍流和空间等离子体演化过程的自洽图景。第一部分研究的方法是基于路径积分方法和动态重整化群理论，并结合直接的数值模拟。将开发描述极光带各向异性间歇和异常输送的实际模式。研究计划的第二部分是基于粒子分布与间歇传播和非传播涨落的相互作用。为极地风、太阳风和极光离子的演化开发的全球混合模拟模型将得到加强，并应用于确定相互作用。该项目还将有助于在麻省理工学院与麻省理工学院研究生院和麻省理工学院少数民族暑期研究项目(MSRP)合作主办的空间等离子体物理学研讨会和讲习班。此外，还将与总部设在华盛顿的卓越教育中心(CEE)合作，赞助天才级别的高中生的教育。通过与麻省理工学院的科学家打成一片，这些年轻的实习生将获得地球等离子体物理科学研究的第一手经验。

Considerable observational and theoretical attention has been devoted towards the understanding of local, point observations of geospace plasma phenomena observed by research satellites. However, it is clear that there are important questions that involve global and multiscale issues: questions of energy and momentum transport within the magnetosphere, ionosphere and the Sun-Earth connection region, and of the nature of the particle populations, their source, entry, energization, diffusion, and ultimate loss from the systems. Theoretical models are being forced to confront issues of non-locality and "complexity". For systems involving non-locality and complexity effects connected with the fluctuations of the electric and magnetic fields, the in homogeneities, and anomalous anisotropic transport and energization processes are important. This project will quantitatively examine the plasma turbulence and the intermittent fluctuations in the geospace region. Detailed spectra and other stochastic properties of both the non-propagating and propagating portions of the turbulence will be determined and compared with experimental observations. The goal is to produce a self-consistent picture of the complexity-generated, intermittent turbulence and the evolutionary processes of space plasmas. The mode of approach for the first part of the research is based on the method of path integrals and the theory of the dynamic renormalization group along with direct numerical simulations. Realistic models characterizing the anisotropic intermittency and anomalous transport of the auroral zone will be developed. The second part of the research program is based on the interaction of the particle distributions with both the intermittent propagating and non-propagating fluctuations. A global hybrid simulation model developed for the evolution of the polar wind, solar wind, and auroral ions will be enhanced and applied to determine the interactions. The project will also contribute to symposia and workshops on the physics of space plasmas, which will be hosted at MIT in cooperation with the MIT Graduate School and the MIT Minority Summer Research Program (MSRP). In addition there will be collaborations with the Washington-based Center of Excellence in Education (CEE) to sponsor the education of genius-level high school students. By intermingling with the scientists at MIT, these young interns will obtain first hand experience in scientific research in geoplasma physics.