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.

关于太阳高能粒子（SEP）如何与地磁场相互作用仍然存在许多问题。这些粒子在太阳耀斑和日冕物质抛射等爆炸事件发生后流入地磁环境。粒子可能会被困在地磁场中，这些粒子的能量以及地球空间环境（包括当前系统）会影响它们的穿透距离。该博士后奖学金支持该主题的研究，这对于了解空间天气对卫星等敏感系统的影响非常重要，因为卫星可能会被标准必要事件损坏。除了支持早期职业科学家之外，该项目还包括创建一个空间天气演示，该演示将用于教育推广活动。将采用基于观测的综合建模方法来提供统计见解，了解影响 SEP 进入太空的过程。地磁场。该研究利用了 20 个太阳高能粒子事件，这些事件发生在 2013 年 1 月至 2017 年 12 月期间的一系列风暴和非风暴条件下，并由至少两颗卫星进行测量。使用多航天器方法，将同时在各种径向距离、能量和一系列磁本地时间下检查观测结果。利用在磁层内部观测到的太阳质子的东西方向通量各向异性，可以测量近赤道区域的粒子截止。他们将现场测量的能量和方向相关截止值与通过使用粒子跟踪模型计算出的地磁截止值进行比较。使用 Tsyganenko 2005 粒子追踪模型，他们将确定哪些当前系统有助于抑制地磁截止。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。