Acceleration of Radiation Belt Electrons: In Situ Heating vs. Inward Radial Transport

辐射带电子的加速：原位加热与向内径向传输

• 批准号: 0842388
• 负责人: Xinlin Li
• 金额: $ 30.23万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0842388&HistoricalAwards=false
• 关键词: Acceleration; Radiation; Belt; Electrons; Situ

Electrons in Earth's radiation belts can have serious effects on spacecraft electronics through radiation damage and deep dielectric charging. The physical mechanisms governing the variability of these energetic electrons are still hot topics of debate. The paradigm for explaining the creation of the electron radiation belts has recently been shifting from one using only the theory of radial diffusion to one including an important role for plasma waves. The interaction of plasma waves with the electrons can result in in situ heating. This project will investigate the relative contribution of radial diffusion and in situ heating to the enhancement of MeV electrons inside geosynchronous orbit. An internal source term will be added to a currently existing radial diffusion model. Measurements of electrons using Los Alamos National Laboratory (LANL) satellite data at geosynchronous orbit will be used to determine the source population. Realistic loss rates will be determined from data taken from the SAMPEX satellite. The model results will then be compared to GPS satellite measurements inside geosynchronous orbit. In this way, it will be possible to determine how much enhancement of the MeV electrons measured by GPS can be attributed to inward radial transport and how much to in situ heating. This project will include research and training for graduate students. The results will enhance our ability to predict an important space weather phenomenon.

地球辐射带中的电子会通过辐射损伤和深度介电充电对航天器电子物质产生严重影响。管理这些能量电子的可变性的物理机制仍然是争论的热门话题。最近，解释电子辐射带创建的范式最近仅使用径向扩散理论转变为血浆波的重要作用。血浆波与电子的相互作用会导致原位加热。该项目将研究径向扩散和原位加热对地球同步轨道内MEV电子的相对贡献。内部源术语将添加到当前现有的径向扩散模型中。 使用Los Alamos国家实验室（LANL）卫星数据的电子测量将用于确定来源人群。现实的损失率将从从Sampex卫星获取的数据中确定。然后将将模型结果与GPS卫星测量值进行比较。这样，可以确定通过GP测量的MEV电子的增强量可以归因于内向径向传输以及原位加热多少。该项目将包括针对研究生的研究和培训。 结果将增强我们预测重要空间天气现象的能力。