Turbulent Plasma and Astrophysical Shocks in Solar-Terrestrial PhysicsThe project will focuses on key physical processes upstream of the quasi-paralle

该项目将重点研究准平行无碰撞冲击上游的关键物理过程：线性和非线性大振幅磁波动及其与观测粒子谱的关系，以及由非线性动力学不稳定阶段引起的体等离子体加热。具体目标包括量化不同类型磁扰动中粒子分布与功率之间的关系，探索非线性波在准平行前震等离子体动力学中的作用，以及了解粒子分布的不稳定尾部如何与核心耦合。我们的目标是利用多航天器观测和数值模拟的数据分析来推进当前对这些系统的准线性和非线性动力学的理解。先进的多点数据分析技术将应用于来自Cluster和MMS任务的地面前震的原位测量。帕克太阳任务对内太阳风冲击的单点观测也将被使用。准平行激波的二维数值模拟将用于理解观测到的等离子体不稳定性的非线性相位，例如由温度各向异性驱动的这些不稳定性。

The project will focuses on key physical processes upstream of the quasi-parallel collisionless shocks: linear and nonlinear large amplitude magnetic fluctuations and their relation to the observed particle spectra, and bulk plasma heating caused by the nonlinear stages of kinetic instabilities. Specific objectives include quantifying the relation between particle distributions and the power in magnetic perturbations of different types, exploring the role of nonlinear waves in the plasma dynamics of the quasi-parallel foreshocks and understanding how unstable tails of the particle distribution couple to its core. We aim to progress current understanding of quasi-linear and nonlinear dynamics of these systems, using data analysis of multi-spacecraft observations and numerical simulations. Advanced multi-point data analysis techniques will be applied to in-situ measurements of the terrestrial foreshock from Cluster and MMS missions. Single-point observations of shocks in the inner solar wind from the Parker solar mission will also be used. Two-dimensional numerical simulations of the quasi-parallel shock will be used to understand the nonlinear phase of the observed plasma instabilities, such as these driven by the temperature anisotropies.