Collaborative Research: NSWP: Modeling and Observations of the East-West Effect in Solar Energetic Particle Flux at Geosynchronous

合作研究：NSWP：地球同步太阳高能粒子通量东西向效应的建模和观测

• 批准号: 1023339
• 负责人: Brian Kress
• 金额: $ 8.41万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1023339&HistoricalAwards=false
• 关键词: Collaborative; Research; NSWP; Modeling; Observations

Solar energetic particle (SEP) events result from solar flares or from shock waves associated with Coronal Mass Ejections. The particles consist of both ions and electrons that have relativistic energies and reach Earth within minutes to a few hours of the event that initially generated the particles. Because of their very high energies and the speed with which they reach the Earth, these events represent significant space weather hazards. Within Earth's magnetosphere there is often a large difference between the eastward and westward fluxes of the energetic particles. This project will generate a physics-based, quantitative model of the particle fluxes within the magnetosphere at locations where direct observations are unavailable. The project will utilize global test particle simulations within an empirical magnetosphere mdoel that is driven by the solar wind parameters. The simulations will investigate the electric current systems within the magnetosphere that lead to variations in the geomagnetic cutoffs of the particles. Data from the GOES geosynchronous satellites will be used to determine the magnitude of the east-west asymmetry. It will establish statistical relationships between the state of the solar wind and the relative magnitudes of the eastward and westward particle fluxes.

太阳高能粒子(SEP)事件是太阳耀斑或与日冕物质抛射相关的冲击波的结果。这些粒子由离子和电子组成，它们具有相对论能量，在最初产生粒子的事件发生后几分钟到几个小时内到达地球。由于它们的能量非常高，到达地球的速度也很快，这些事件代表着重大的空间天气危害。在地球磁层内，高能粒子向东和向西的通量之间往往有很大的差异。该项目将为磁层内无法直接观测的位置的粒子通量生成一个基于物理的定量模型。该项目将利用由太阳风参数驱动的经验磁层模型中的全球测试粒子模拟。这些模拟将调查磁层内的电流系统，这些电流系统导致粒子的地磁截止值发生变化。来自GOES地球同步卫星的数据将被用来确定东西不对称的强度。它将在太阳风的状态和向东和向西的粒子通量的相对大小之间建立统计关系。