Fundamental investigations of compressible MHD turbulence

可压缩 MHD 湍流的基础研究

• 批准号: 0613622
• 负责人: Benjamin Chandran
• 金额: $ 30万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0613622&HistoricalAwards=false
• 关键词: Fundamental; investigations; compressible; MHD; turbulence

AST-0613622ChandranMagnetohydrodynamic (MHD) turbulence is a critical unsolved problem in basic plasma physics. Although major progress has been made in the theory of incompressible MHD turbulence, much less is known about compressible MHD turbulence, which is of great importance for physical applications. This research will lead to a comprehensive theory of weak compressible MHD turbulence in plasmas where the pressure is low compared to the magnetic energy density. This theory will provide analytic and numerical results including kinetic effects, to investigate dissipation at collisionless scales and to determine the distribution of turbulent heating between particle species. The results will be crucial for understanding the role that turbulence plays in accelerating particles in solar flares and in heating the solar corona.The project will achieve a broader impact through a variety of training and outreach activities, including graduate and undergraduate students with a special effort to recruit women and other under-represented groups. An introductory presentation describing elementary principles and important applications of plasma physics, aimed at the secondary school level, will help to increase understanding of science and to stimulate student interest in science careers.

AST-0613622Chandran 磁流体动力学 (MHD) 湍流是基础等离子体物理学中一个尚未解决的关键问题。 尽管不可压缩 MHD 湍流理论已经取得了重大进展，但对对于物理应用具有重要意义的可压缩 MHD 湍流知之甚少。这项研究将产生等离子体中弱可压缩 MHD 湍流的综合理论，其中压力低于磁能密度。 该理论将提供包括动力学效应在内的分析和数值结果，以研究无碰撞尺度的耗散并确定粒子种类之间的湍流加热分布。 这些结果对于理解湍流在加速太阳耀斑中的粒子和加热日冕方面所起的作用至关重要。该项目将通过各种培训和外展活动取得更广泛的影响，包括研究生和本科生，并特别努力招募女性和其他代表性不足的群体。 针对中学水平的介绍性演示描述了等离子体物理学的基本原理和重要应用，将有助于增加对科学的理解并激发学生对科学职业的兴趣。