Theoretical Modeling of the Inner Radiation Belt

内辐射带的理论模型

• 批准号: 0337390
• 负责人: Richard Selesnick
• 金额: $ 6万
• 依托单位: Aerospace Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-02-01 至 2005-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0337390&HistoricalAwards=false
• 关键词: Theoretical; Modeling; Inner; Radiation; Belt

This project will use a software toolkit developed at CERN and referred to as GEANT4. The GEANT4 software will be applied to the interaction of neutrons with the atmosphere. The interaction of cosmic rays with the atmosphere generates albedo neutrons. The atmospheric response as a function of input cosmic ray energy and composition will be determined. The response function will then be convolved with the cosmic ray energy spectrum, which has a solar cycle dependence, to obtain the albedo neutron flux as a function of time. The decay of the albedo neutrons produces the proton content of the Earth's inner radiation belt. The neutron flux can therefore be converted to a model of the energy and density of the protons in the inner belt. The model results will be compared with proton data obtained by the AMPEX satellite over the most recent solar cycle. Agreement between the model and the data will validate the GEANT4 toolkit as a framework for further space weather modeling of the inner radiation belt.

该项目将使用欧洲核子研究中心开发的软件工具包，称为GEANT4。GEANT4软件将用于中子与大气的相互作用。宇宙射线与大气的相互作用产生反照率中子。将确定大气响应作为输入宇宙射线能量和成分的函数。然后将响应函数与与太阳周期相关的宇宙射线能谱进行卷积，得到反照率中子通量作为时间的函数。反照率中子的衰变产生了地球内部辐射带的质子含量。因此，中子通量可以转换为内部带中质子能量和密度的模型。该模型的结果将与AMPEX卫星在最近的太阳活动周期中获得的质子数据进行比较。模型和数据之间的一致性将验证GEANT4工具包作为进一步对内辐射带进行空间天气建模的框架。