Complexity Induced Bimodal Anisotropic Intermittent Turbulence in Geospace

对于研究卫星观测到的地球空间等离子体现象的局部、点观测的理解，已经投入了相当大的观测和理论关注。然而，很明显，有一些重要的问题涉及到全球和多尺度的问题：磁层、电离层和太阳-地球连接区域内的能量和动量输运问题，以及粒子群的性质、它们的来源、进入、通电、扩散和最终从系统中损失的问题。理论模型正被迫面对非定域性和“复杂性”的问题。对于涉及与电场和磁场波动有关的非定域性和复杂性效应的系统，非均质性和异常各向异性输运和能量化过程是重要的。本项目将定量研究等离子体湍流和地球空间区域的间歇性波动。将确定湍流的非传播和传播部分的详细光谱和其他随机特性，并与实验观测结果进行比较。目标是对空间等离子体产生的复杂性、间歇性湍流和演化过程产生自一致的图像。第一部分的研究方法是基于路径积分法和动态重整化群理论，并结合直接数值模拟。将发展表征极光带各向异性间歇性和异常输运的现实模型。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波动的相互作用。为极地风、太阳风和极光离子演化建立的全球混合模拟模型将得到加强，并应用于确定相互作用。该项目还将为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计划（MSRP）合作举办的空间等离子体物理学专题讨论会和研讨会做出贡献。此外，还将与位于华盛顿的卓越教育中心（CEE）合作，赞助天才高中学生的教育。通过与麻省理工学院的科学家交往，这些年轻的实习生将获得地球等离子体物理学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.