Strong Alfven-Wave Turbulence with Cross Helicity

具有交叉螺旋度的强阿尔文波湍流

• 批准号: 1003451
• 负责人: Benjamin Chandran
• 金额: $ 46.6万
• 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: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003451&HistoricalAwards=false
• 关键词: Strong; Alfven; Wave; Turbulence; Cross

This Principal Investigator (PI) will use computational methods to address the problem of imbalanced magnetohydrodynamic (MHD) turbulence in the solar wind, particularly near the Sun. The PI's team will develop a new computer code to solve the 'reduced MHD' (RMHD) equations for incompressible turbulence, taking account of the inhomogeneous density and background flow characteristics of the solar wind. These fundamental equations will be solved under a variety of conditions and the solutions will be used to examine plasma density effects and the heating of test-particle ions propagating within the computed electromagnetic fields. The PI's approach is novel because of its inclusion of reflected waves in his turbulence model. His numerical results will be used to test several existing theories of turbulence and to revise these theories as needed to account for wave reflection. Based on this work, the PI will deliver targeted lectures in plasma physics short courses developed for graduate students, postdoctoral researchers, and advanced undergraduate students. By providing these young scientists with specialized training and exposure to ongoing research developments, these short courses will promote the integration of research and education. The PI is also a Working Group Leader in the Solar, Heliospheric, and Interplanetary Environment (SHINE) research community, as well as a member of the SHINE Steering Committee. In this capacity, the PI will actively contribute to organizing the annual SHINE Workshop, which provides student participants with special tutorial sessions and opportunities to present their own research. By placing a high priority on student involvement, the SHINE Workshop has been an effective means of integrating research and education.

这位首席研究员（PI）将使用计算方法来解决太阳风中不平衡的磁流体动力学（MHD）湍流问题，特别是在太阳附近。PI的团队将开发一种新的计算机代码来解决不可压缩湍流的“简化MHD”（RMHD）方程，同时考虑太阳风的不均匀密度和背景流动特性。这些基本方程将在各种条件下求解，并将用于检查等离子体密度的影响和加热的测试粒子离子在计算的电磁场内传播的解决方案。PI的方法是新颖的，因为它包括反射波在他的湍流模型。他的数值结果将被用来测试几个现有的湍流理论，并根据需要修改这些理论，以解释波的反射。基于这项工作，PI将提供针对研究生，博士后研究人员和高级本科生开发的等离子体物理短期课程的有针对性的讲座。通过向这些青年科学家提供专门培训和接触正在进行的研究发展，这些短期课程将促进研究与教育的结合。PI也是太阳、日光层和行星际环境（SHINE）研究社区的工作组组长，以及SHINE指导委员会的成员。在这方面，PI将积极参与组织年度SHINE研讨会，为学生参与者提供特别辅导课程和展示自己研究的机会。通过高度重视学生的参与，SHINE研讨会一直是整合研究和教育的有效手段。