Turbulence Transport in Sub-Alfvenic and Subsonic Astrophysical Plasma Flows

亚芬尼和亚音速天体物理等离子体流中的湍流传输

• 批准号: 390744075
• 负责人: Privatdozent Dr. Horst Fichtner
• 金额: --
• 依托单位: Institut für Theoretische Physik IV: Weltraum- und Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/390744075?language=en
• 关键词: Turbulence; Transport; Sub; Alfvenic; Subsonic

With the proposed 3-year research project we intend to intensify the successful collaboration between the Ruhr-Universität of Bochum, Germany, and the University of Waikato, Hamilton, New Zealand, that was recently initiated within the framework of a dedicated 1-year DFG funding on the topic of coupled plasma fluid and turbulence transport modelling of the heliosphere and of astrospheres. The main goals of the proposed research project are (i) a quantitative assessment of the transport of turbulence in the outer sub-Alfvenic and subsonic regimes of the solar wind and other stellar winds, and (ii) a quantitative study of the resulting transport of energetic particles. Consequently, the primary objective of the project is the answering of the following three scientific key questions regarding the turbulence evolution as well as the transport processes and the corresponding transport equation:(1) How can the transport of turbulence in the partially sub-Alfvenic and subsonic inner heliosheath (between the solar wind termination shock and the heliopause) and in stellar astrosheaths (between the stellar wind termination shocks and the bow shocks) be described quantitatively within the framework of a multi-component model?,(2) How does the turbulence evolution in the inner heliosheath and in stellar astrosheaths influence the spatial and temporal variation of the transport parameters of cosmic rays?, and (3) What are the solutions of the cosmic ray transport equation when using the new compressible turbulence model to obtain the transport parameters?By attaining the goals of this timely project we will not only supplement the much needed models of turbulence evolution with a new, three-component description that, for the first time, will allow for a simultaneous and self-consistent treatment of quasi-twodimensional, wave-like, as well as compressive fluctuations, but we will also establish a significantly improved conceptual framework for the modelling of the transport conditions of energetic particles in both the inner heliosheath and in stellar astrosheaths. In view of the recent, and ongoing, in-situ measurements made in the heliosheath by the Voyager spacecraft and the potential importance of astrospheres for cosmic ray acceleration and cosmic ray anisotropies, both transport environments are of high contemporary interest for the helio- and astrophysics communities.

通过拟议的为期三年的研究项目，我们打算加强德国Bochum的Ruhr-Universität与新西兰汉密尔顿的Waikato大学之间的成功合作，该公司最近在专门的1年DFG资金的框架内启动了有关等离子体流动和涡轮运输模型的专用1年DFG资金。拟议的研究项目的主要目标是（i）对太阳风和其他恒星风的湍流的转运定量评估，以及（ii）对产生能量颗粒的运输的定量研究。因此，该项目的主要目标是回答以下三个有关湍流进化以及运输过程以及相应的运输方程的科学关键问题：（1）如何在部分亚电动性和亚音速内部的螺旋壳中的湍流运输以及在Solar Wind终止势头和震撼的螺旋中（终结）的范围（之间）（在Stellar semplass winders之间）在多组分模型的框架内定量？（2）内部螺旋壳和恒星恒星中的湍流演化如何影响宇宙射线传输参数的空间和临时变化？以及（3）在使用该宇宙射线运输范围的求解时，可以实现新的压缩构图的求解，从而获得了什么能够获得新的压缩构图。不仅将急需的湍流演化模型补充了一个新的三部分描述，该描述首次将允许对准二维的，类似波浪状波动的简单且自一的治疗方法，以及我们还将在能量构成的构图中建立了一个内在的构图和内在的概念，并建立了一个很大的改进的概念框架。鉴于旅行者航天器在HelioSheath在Heliosheath中进行的近期和持续的原位测量以及天文合体对于宇宙射线加速度和宇宙射线各向异性的潜在重要性，这两个运输环境都对热线和天体型社区具有很高的现代利益。