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

首席研究员将对太阳和 1AU 之间太阳风典型的湍流场中带电高能粒子的动力学进行真实的描述，包括所有中间非共振尺度。她打算在非常广泛的尺寸尺度上模拟磁场线 (MFL) 输运和色散，并研究这些场中粒子的俯仰角散射和色散。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剖面进行详细分析，以寻找有关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。她将模拟湍流 SW 中的漂移 MFL 和粒子轨迹，以量化对跨 MFL 和沿 MFL 的漂移和纯粒子散射、粒子输运、MFL 跨场位移和 MFL 分离的影响。这项对湍流太阳风中的 MFL 和高能粒子扩散的多尺度研究对于预测地球上的太阳高能粒子 (SEP) 强度至关重要，因此可以实现国家空间天气计划的目标。 SEP 对太空中的卫星运行、通信和宇航员构成重大威胁。除了空间物理学和空间天气预报之外，湍流磁场中粒子的传输也是天体物理学和等离子体物理学研究的基础。

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.