AGS-PRF: The Exit of Energetic Particles from the Earth's Magnetosphere

AGS-PRF：高能粒子从地球磁层中退出

• 批准号: 1136827
• 负责人: Brian Walsh
• 金额: $ 8.6万
• 依托单位: Walsh Brian M
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1136827&HistoricalAwards=false
• 关键词: AGS; PRF; Exit; Energetic; Particles

This project will analyze observations of energetic particles in the region of Earth's magnetopause and magnetosheath. It will study the processes that lead to the transport of plasma out of the magnetosphere and into the solar wind. The observations will come from the five THEMIS spacecraft. The changing orbits of the spacecraft provide several useful configurations allowing for simultaneous measurements of source and loss populations at different radial locations along the magnetopause. Observations have also been made where multiple spacecraft pass through similar places along the magnetopause at similar times which makes it possible to study small-scale temporal and spatial structures. Mechanisms that may lead to plasma loss from the magnetosphere include magnetic reconnection, particle drifts due to gradients in the magnetic field and diffusion. The observations will be compared with the Fok Radiation Belt Environment (RBE) model to test if loss rates from the model are consistent with observations under different conditions.Quantifying the conditions under which energetic particles are lost through the dayside magnetopause is an important aspect in understanding the dynamics of Earth's radiation belt. This is a topic that has relevance to our understanding of space weather.

该项目将分析对地球磁层顶和磁鞘区域高能粒子的观测。 它将研究导致等离子体从磁层转移到太阳风中的过程。 观测将来自五个THEMIS航天器。 不断变化的轨道的航天器提供了几个有用的配置，允许同时测量源和损失人口在不同的径向位置沿着磁层顶。 还对多个航天器在类似时间沿磁层顶沿着经过类似地点的情况进行了观测，从而有可能研究小规模的时间和空间结构。 可能导致等离子体从磁层损失的机制包括磁场重联、由于磁场梯度和扩散而引起的粒子漂移。 观测结果将与Fok辐射带环境（RBE）模型进行比较，以检验在不同条件下，模型的损失率与观测结果是否一致。量化高能粒子通过向阳面磁层顶损失的条件是理解地球辐射带动力学的一个重要方面。 这是一个与我们对空间天气的理解相关的主题。