AGS-PRF: An Observational-based Modeling Approach for Solar Energetic Particle Access to the Equatorial Inner Magnetosphere

AGS-PRF：一种基于观测的太阳高能粒子进入赤道内磁层的建模方法

• 批准号: 2028492
• 负责人: Rachael Filwett
• 金额: $ 19万
• 依托单位: Filwett, Rachael
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2028492&HistoricalAwards=false
• 关键词: AGS; PRF; Observational; based; Modeling

Many questions remain about how solar energetic particles (SEPs) interact with the geomagnetic field. These particles stream into the geomagnetic environment following explosive events, such as flares and coronal mass ejections from the Sun. Particles may become trapped in the geomagnetic field and the energy of these particles as well as the geospace environment, including current systems, affect how far they penetrate. This postdoctoral fellowship supports research on this topic, which is important to understanding space weather impacts to sensitive systems like satellites, which can be damaged by SEPs. In addition to supporting an early career scientist, this project includes the creation of a space weather demonstration that will be used in educational outreach events.A comprehensive observational-based modeling approach will be employed to provide statistical insights into what processes affect SEP access into the geomagnetic field. The study utilizes 20 solar energetic particle events, which occur during a range of storm and non-storm conditions, from January 2013-December 2017, and which are measured with at least two satellites. Using a multi-spacecraft approach, the observations will be examined at a wide variety of radial distances, energies, and at a range of magnetic local times simultaneously. Utilizing the east-west directional flux anisotropy for solar protons observed in the inner-magnetosphere it is possible to measure particle cutoffs in the near-equatorial region. They will compare the energy and directional dependent cutoffs measured in-situ to the geomagnetic cutoffs calculated via the use of particle tracking models. Using the Tsyganenko 2005 particle tracing model they will determine which current systems contribute to suppressed geomagnetic cutoffs.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

关于太阳能颗粒（SEP）如何与地磁场相互作用的许多问题仍然存在。这些颗粒在爆炸性事件之后流入地磁环境中，例如太阳的耀斑和冠状质量弹出。颗粒可能被困在地磁场中，这些颗粒的能量以及包括当前系统在内的地理环境会影响它们穿透的距离。该博士后奖学金支持对该主题的研究，这对于理解太空天气对诸如卫星等敏感系统的影响很重要，卫星可能会受到SEP的损害。除了支持早期职业科学家外，该项目还包括创建将在教育外展活动中使用的太空天气演示。将采用一种全面的基于观察的建模方法来提供有关哪些过程影响SEP进入地理磁场的统计见解。该研究利用了2013年1月12日至12月至12月的20种太阳能颗粒事件，发生在风暴和非风暴条件范围内，并以至少两个卫星进行测量。使用多飞机运动物方法，将在各种径向距离，能量和一系列磁性局部时期进行观察。利用在内部磁层中观察到的太阳质子的东西方定向通量各向异性，可以测量近乎赤道区域的颗粒截止。他们将比较通过使用粒子跟踪模型计算出的现场测量的能量和方向依赖性截止。使用Tsyganenko 2005粒子追踪模型，他们将确定哪种当前系统有助于被抑制的地磁截止。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估评估标准的评估值得支持的。