GEM Systems Science: Creating and Analyzing an Earth Index Collection

GEM Systems Science：创建和分析地球索引集合

• 批准号: 1502947
• 负责人: Joseph Borovsky
• 金额: $ 36万
• 依托单位: SPACE SCIENCE INSTITUTE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-04-15 至 2020-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1502947&HistoricalAwards=false
• 关键词: GEM; Systems; Science; Creating; Analyzing

The Geospace Environment Modeling (GEM) Program is a broad-based, community-initiated research program on the physics of the Earth's magnetosphere and the coupling of the magnetosphere to the atmosphere and to the solar wind. The work of GEM is accomplished in a series of campaigns and focus groups that solve specific problems leading to the construction of a global Geospace General Circulation Model (GGCM) with predictive capability. This project will contribute essential results to this goal pertaining to understanding the global reaction of the Earth's magnetosphere-ionosphere system to the solar wind and how the solar wind couples to the magnetosphere. The reaction of the magnetosphere to driving as well as the driving by the solar wind are more complex than commonly thought and than current models can capture or explain. This Investigation will perform a comprehensive statistical analysis to explore those complexities. The data sets created and the findings of the analysis will be disseminated via a new "Earth Index Collection" webpage to be created. Tutorials, examples, and research suggestions will also be made available via the webpage.This Investigation will take a systems-science approach, analyzing the reaction of the multiply measured magnetosphere to the full solar-wind data set. It will collect and create a large number of time-dependent indices, each one being a different measure of the magnetosphere-ionosphere system. The "indices" will be measures of the currents, plasmas, energetic particles, waves, morphology, and energy flow in the system. The collection of time-dependent indices will be put together to form a time-dependent "Earth Index Collection" of measurements. Canonical correlation analysis will be used to identify and explore correlation patterns between the multivariable Earth index collection and the multivariable solar-wind data set. For the primary mode of reaction of the Earth index collection to the solar wind, a time-dependent "collective index" will be identified and defined and the universal coupling function that drives that primary mode will be defined. Secondary global modes of the reaction of the Earth to the solar wind will be identified, cataloged, and investigated and the properties of the solar wind (the secondary coupling functions) that drive the secondary modes will be identified. Attempts will be made to connect the secondary coupling functions with physical mechanisms such as the viscous interaction, changes in the location of the dayside reconnection line, and changes in the morphology of the magnetosphere. By analysis of the secondary modes of reaction, the "sectors" of the Earth index collection will be identified and the indices that comprise each sector will be cataloged. Exploring suppression and confounding in the multivariable solar-wind data set as its variables correlate with the Earth measurements, causal correlations versus non-causal correlations will be identified. Finally, traditional data-analysis methods will be used to elucidate the sectors and the global modes of reaction of the magnetosphere to the solar wind.

Geospace环境建模（GEM）计划是一项基于广泛的，社区引发的研究计划，内容涉及地球磁层物理学以及磁层与大气和太阳风的耦合。 宝石的工作是在一系列活动和焦点小组中完成的，这些活动和焦点小组解决了具有预测能力的全球地理航天通用循环模型（GGCM）的构建。该项目将为这一目标带来与理解地球磁层 - 离子层系统对太阳风的全球反应以及太阳能伴侣如何与磁层的全球反应有关的基本结果。 磁层对驾驶以及太阳风的驾驶的反应比普遍认为的要复杂，而当前模型可以捕获或解释。这项调查将进行全面的统计分析以探索这些复杂性。 创建的数据集和分析的发现将通过要创建的新“ Earth Index Collection”网页传播。教程，示例和研究建议也将通过网页提供。此研究将采用系统科学方法，分析了多重测量的磁层对完整太阳能数据集的反应。它将收集并创建大量时间依赖性指数，每个指数都是磁层 - 离子层系统的不同度量。 “指数”将是系统中电流，等离子体，能量颗粒，波，形态和能量流的测量。时间相关指数的集合将组合在一起，形成时间依赖的测量“地球指数集合”。规范相关分析将用于识别和探索多变量的地球索引收集与多变量太阳能数据集之间的相关模式。对于地球指数收集到太阳风的主要反应方式，将确定和定义时间依赖时间的“集体指数”，并定义驱动该主要模式的通用耦合函数。将确定，分类和研究地球对太阳风的反应的二级全局模式，并将确定驱动次级模式的太阳风（二次耦合函数）的性质。将尝试将次级耦合函数与物理机制（例如粘性相互作用，时代重新连接线的位置变化以及磁层形态的变化）连接起来。通过分析反应的次要模式，将确定地球指数收集的“扇区”，并将构成每个部门的指数分类。将探索抑制和混淆，因为其变量与地球测量值相关，将确定其因果关系与非因果关系。最后，传统的数据分析方法将用于阐明磁层对太阳风的扇区和全局反应模式。