Collaborative Research: Self-Consistent Ring-Current Particle Transport Simulations

合作研究：自洽环流粒子输运模拟

• 批准号: 0548915
• 负责人: Michael Schulz
• 金额: $ 10.5万
• 依托单位: Lockheed-Martin Advanced Technology Center
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-15 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0548915&HistoricalAwards=false
• 关键词: Collaborative; Research; Self; Consistent; Ring

This project seeks to understand the dynamics of the Earth's ring current during magnetic storms and to understand its effects on the inner magnetospheric (IM) magnetic field structure. While it is well known that the formation of a ring current leads to large magnetic field depressions in the inner magnetosphere, there is not yet a sufficient comprehensive understanding of global variations in IM magnetic field structure during magnetic storms. Such an understanding is critically needed because the IM magnetic field affects IM particle transport, energization, and loss. The approach toward this objective is to apply magnetically and electrostatically self-consistent kinetic ring current simulations for storm events and to compare the simulation results with in-situ particle measurements from satellite instruments such as the CAMMICE and MFE instruments on and energetic neutral atom(ENA) images ENA images from the IMAGE spacecraft.The project will specifically address (a) the spatial and temporal variation of the ring current and its magnetic signature for different geomagnetic storms, (b) the asymmetry of the ring current and how well the ASY-H index characterizes such asymmetries, (c) the actual contribution of the ring current to the Dst magnetic index, (d) the amount that induced electric fields mitigate the energization of ring current particles during the main phase and (if at all) prolong the recovery phase of a magnetic storm, and (e) the effects of self-consistent electrostatic fields, by taking account of magnetospheric plasma pressure and ionospheric conductances (including effects of precipitating electrons) on particle transport and loss. As part of this research, an assessment of how well self-consistent simulation-based kinetic models of the ring current can account for plasma pressure and current density distributions (inferred from ion-flux measurements) and measured magnetic and electric intensities will be made. In addition to simulating storm events, numerical experiments will be made to elucidate the physical processes. The simulations and simulation/data comparisons of the ring-current magnetic field will help guide community-wide efforts toward developing more realistic models of the inner magnetospheric magnetic field that are critically needed for research and space weather applications.

该项目试图了解磁性风暴期间地球环电流的动力学，并了解其对内部磁层（IM）磁场结构的影响。众所周知，环电流的形成会导致内部磁层的巨大磁场凹陷，但尚无对磁性风暴期间IM磁场结构的整体变化的全面了解。由于IM磁场会影响IM颗粒的传输，能量和损失，因此需要这种理解。实现这一目标的方法是在风暴事件中应用磁性和静电性的自洽动力环电流模拟，并将模拟结果与卫星仪器的原子粒子测量结果进行比较，例如，cammice和mfe仪器（例如，诸如cammice and Mfe仪器）（以及能量中性原子（ena）图像eNA图像eNA的图像extiration the Image spacecemal and Protive the Promient and spat and spat and spat and the Promitation and spat and a）。对于不同的地磁风暴，（b）环电流的不对称性以及ASY-H指数表征的表征，（（c）环电流对DST磁性指数的实际贡献，（d）诱导电场减轻电场的电场的数量，在整个阶段和（如果在所有阶段）效应的阶段和循环阶段（如果是）持续阶段（如果是）持续的磁场（如果是）的持续阶段（如果是），并且是恢复阶段的均值（如果是），并且是恢复的磁场（如果是均值），并且是循环的磁场（如果是），并且是循环的磁场（如果是conterative of）。通过考虑磁层等离子体压力和电离层电导（包括沉淀电子的影响）对粒子传输和损耗的影响。作为这项研究的一部分，评估了环电流的基于自洽的基于模拟的动力学模型，可以解释等离子压力和电流密度分布（从离子 - 升华测量值推断）以及测量的磁性和电力强度。除了模拟风暴事件外，还将进行数值实验以阐明物理过程。环电流磁场的仿真和模拟/数据比较将有助于指导社区范围内的努力，以开发更现实的磁层磁场模型，这些模型是研究和空间天气应用至关重要的。