M-I Coupling: Quantifying High Latitude Electric Field and Conductance Variability

M-I 耦合：量化高纬度电场和电导变化

• 批准号: 0101825
• 负责人: Geoffrey Crowley
• 金额: $ 19万
• 依托单位: Southwest Research Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0101825&HistoricalAwards=false
• 关键词: Coupling; Quantifying; Latitude; Electric; Field

The investigators will study electric field and conductance variability in the high latitude ionosphere. The study will be conducted using the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) model for a large number of intervals for which a variety of ground-based and space-based measurements are available. The study addresses three scientific questions: (1) What are the spatial and temporal scales of structures in the electric field in the ionosphere? (2) What are the spatial and temporal scales of structures in the ionospheric conductance? (3) How do the structured electric field and conductance affect the global Joule heating? The variability of electric fields and conductances from the AMIE model will be summarized as a function of magnetic latitude, magnetic local time, and geomagnetic activity. The analysis will provide guidance on the amount of variability being omitted in models that have coarser spatial and temporal scales. It also provides guidance on the geophysical processes that need to be understood before physics-based models can completely capture the variability and its effects. The ultimate objective is a better understanding of the coupling between the thermosphere, ionosphere, and magnetosphere during geomagnetically disturbed conditions.

研究人员将研究高纬度电离层中的电场和电导变化。这项研究将使用电离层电动力学同化映射(AMIE)模型对大量时间间隔进行，其中有各种陆基和天基测量。这项研究涉及三个科学问题：(1)电离层电场结构的时空尺度是什么？(2)电离层电导结构的时空尺度是什么？(3)结构电场和电导对全球焦耳加热有何影响？Amie模型中电场和电导的变化将被总结为磁纬度、磁当地时和地磁活动的函数。该分析将为具有较粗空间和时间尺度的模型中被省略的变异性的量提供指导。它还提供了关于地球物理过程的指导，在基于物理的模型能够完全捕捉变异性及其影响之前，需要了解这些过程。最终目标是更好地理解地磁扰动条件下热层、电离层和磁层之间的耦合。