NSWP: Multiscale Study of Magnetic Field-Line and Energetic Particle Dispersal in the Turbulent Solar Wind

NSWP：湍流太阳风中磁场线和高能粒子扩散的多尺度研究

• 批准号: 0817094
• 负责人: Brigitte Ragot
• 金额: $ 15.26万
• 依托单位: Helio Research
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-10-01 至 2011-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0817094&HistoricalAwards=false
• 关键词: NSWP; Multiscale; Study; Magnetic; Field

The Principal Investigator will develop a realistic description of the dynamics of charged energetic particles in turbulent fields typical of the solar wind between the Sun and 1AU, including all intermediate non-resonant scales. She intends to model magnetic field-line (MFL) transport and dispersion on a very broad range of size scales, as well as investigate the pitch-angle scattering and dispersal of particles in those fields. Using data from the ACE and Wind spacecraft, the PI plans a detailed analysis of solar flare particle-intensity time profiles to search for direct observational clues about solar wind field-line wandering and particle scattering, and to test innovative theoretical and numerical models. She will simulate wandering MFLs and particle trajectories in the turbulent SW in order to quantify the effects on drifts and pure particle scattering across and along MFLs, particle transport, MFL cross-field displacement, and MFL separation. This multi-scale study of MFL and energetic particle dispersal in the turbulent solar wind is crucial to the prediction of solar energetic particle (SEP) intensities at Earth and therefore addresses the goals of the National Space Weather Program. SEPs pose major threats to satellite operations, communications, and astronauts in space. Beyond space physics and space weather forecasting, the transport of particles in turbulent magnetic fields is fundamental to research in astrophysics and plasma physics.

首席研究员将对太阳和1AU之间典型的太阳风的湍流场中带电高能粒子的动力学进行逼真的描述，包括所有中间的非共振尺度。她打算在非常广泛的尺寸范围内对磁力线(MFL)的传输和弥散进行建模，并研究这些场中粒子的俯仰角散射和弥散。利用来自ACE和Wind航天器的数据，PI计划对太阳耀斑粒子强度时间分布进行详细分析，以寻找关于太阳风场线漂移和粒子散射的直接观测线索，并测试创新的理论和数值模型。她将模拟在湍流中漂移的多层流和粒子轨迹，以量化在多层流中和沿多层流的漂移和纯粒子散射、粒子传输、多层膜的跨场位移和多层膜分离的影响。这项关于湍流太阳风中漏磁场和高能粒子扩散的多尺度研究对预测地球上的太阳高能粒子(SEP)强度至关重要，因此解决了国家空间天气计划的目标。SEP对卫星操作、通信和太空中的宇航员构成了重大威胁。除了空间物理和空间天气预报，粒子在湍流磁场中的传输是天体物理和等离子体物理研究的基础。