GEM: Inner Radiation Belt Data Assimilation

GEM：内辐射带数据同化

• 批准号: 0902956
• 负责人: Timothy Guild
• 金额: $ 31.5万
• 依托单位: Aerospace Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-15 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902956&HistoricalAwards=false
• 关键词: GEM; Inner; Radiation; Belt; Data

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This project will determine how short-term dynamics influences the long-term behavior of Earth's inner radiation belt (Van Allen belt). An existing physics based inner radiation belt model developed under a previous NSF Space Weather award will be the starting point of the analysis. Fifteen (15) years of in-situ observations of solar proton trapping and geomagnetic storm-associated losses will be incorporated into the into model of the inner belt using data assimilation techniques. This will comprehensively determine the trapping and loss signatures of the particles as functions of energy, pitch angle, radial distance from the Earth, and geomagnetic and solar wind parameters. Multivariate statistical techniques will be applied to this solar-cycle reanalysis to understand how short-term, inner belt space weather leads to long-term, inner belt climate. This combination of simulations, observations, and data-assimilation statistical techniques has never been applied to the inner belt to answer climatological questions. The project will capitalize on recent scientific progress made in the modeling of the inner belt and will address the primary radiation environment hazard for the satellite design community. The solar-cycle reanalysis of the inner belt will feed directly into the on-going development of more accurate radiation specification models, addressing the top priority radiation environment need of the spacecraft engineering community. This unique connection between research and operations also develops partnerships between communities and across disciplines, and ensures broad dissemination of the results.

该奖项根据 2009 年美国复苏和再投资法案（公法 111-5）提供资金。该项目将确定短期动态如何影响地球内辐射带（范艾伦带）的长期行为。 根据先前的 NSF 空间天气奖开发的现有基于物理的内辐射带模型将成为分析的起点。 十五（15）年的太阳质子捕获和地磁风暴相关损失的现场观测将使用数据同化技术纳入内带模型中。 这将全面确定粒子的捕获和损失特征，作为能量、俯仰角、距地球的径向距离以及地磁和太阳风参数的函数。多元统计技术将应用于太阳周期再分析，以了解短期内带空间天气如何导致长期内带气候。这种模拟、观测和数据同化统计技术的结合从未应用于内陆带来回答气候学问题。该项目将利用最近在内带建模方面取得的科学进展，并将解决卫星设计界的主要辐射环境危害。内带的太阳周期再分析将直接促进更准确的辐射规范模型的持续开发，解决航天器工程界的首要辐射环境需求。研究和运营之间的这种独特联系还发展了社区之间和跨学科的伙伴关系，并确保了结果的广泛传播。