Structured Turbulence, Collisionless Dynamics and Magnetic Field Generation in Astrophysical Plasmas

天体物理等离子体中的结构化湍流、无碰撞动力学和磁场生成

• 批准号: 0098670
• 负责人: James McWilliams
• 金额: $ 27万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0098670&HistoricalAwards=false
• 关键词: Structured; Turbulence; Collisionless; Dynamics; Magnetic

AST 0098670McWilliamsInterstellar magnetic fields play a central role in a variety of important processes in galaxies, notably in star formation and the evolution of molecular clouds. Yet the origin of galactic magnetic fields is poorly understood. This project is conducting numerical studies of the origin and evolution of magnetic fields in galaxies in order to determine how their strength and geometry change over time in response to the combined effects of small-scale disturbances such as supernovae and star formation and large-scale disturbances such as galactic-scale accretion and differential rotation. The project's goals include understanding why the field in our Galaxy undergoes a transition from a relatively weak azimuthal field in the Galactic disk to a strong, dipole field at the Galactic center. The detailed nature of the transition zone will be explored, with particular focus on the stability of the transition and the interplay between the magnetic field and individual clouds. Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***

恒星磁场在星系的各种重要过程中起着核心作用，特别是在恒星形成和分子云的演化中。然而，人们对星系磁场的起源知之甚少。这个项目正在对星系中磁场的起源和演化进行数值研究，以确定它们的强度和几何形状如何随着时间的推移而变化，以响应超新星和恒星形成等小规模干扰和星系尺度吸积和微分旋转等大规模干扰的综合影响。该项目的目标包括理解为什么我们银河系中的场经历了从银河系盘中相对较弱的方位角场到银河系中心强大的偶极子场的转变。将探索过渡区的详细性质，特别关注过渡的稳定性和磁场与单个云之间的相互作用。本项目由美国国家科学基金会星系外天文学和宇宙学项目（AST/EXC）资助