Global Joule Heating

全局焦耳热

• 批准号: 9806600
• 负责人: Geoffrey Crowley
• 金额: $ 29.7万
• 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: 1998
• 资助国家: 美国
• 起止时间: 1998-09-15 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806600&HistoricalAwards=false
• 关键词: Global; Joule; Heating

The goal of this investigation is to enhance an understanding of the global morphology of ionospheric conductivity and Joule heating and to better define their role in the energetics of the thermosphere and ionosphere. The morphology of Joule heating is not well understood at this time because of the difficulty of measuring all the relevant electrodynamic and neutral parameters (e.g. electric fields, conductivities, neutral winds) on both the local and global scales. An accurate knowledge of Joule heating is important because it contributes 10% of the global thermospheric energy budget, and is a major factor in determining the global latitudinal gradients of temperature, wind, composition and hence the F-region electron density. The proposers will use the Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM) and the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) technique to investigate the temporal and spatial morphology of the global conductivity and Joule heating, and its effects. The detailed study of Joule heating is a difficult problem, involving complex modeling techniques and the analysis of multiple data sets, which is beyond the scope of a single investigator. The proposed work requires a team approach, and the proposal team consists of well known experts in their field. The proposed research is vitally important for a detailed understanding of the thermosphere-ionosphere-magnetosphere coupling. This study is directly relevant to a variety of National programs such as CEDAR, the Space Weather Initiative and the NASA/TIMED mission. High school students will be involved in the work through a mentoring program at SwRI.

这项研究的目的是加强对电离层电导率和焦耳热的整体形态的理解，并更好地定义它们在热层和电离层能量学中的作用。 由于难以在局部和全球尺度上测量所有相关的电动和中性参数（例如电场、电导率、中性风），因此目前对焦耳热的形态还没有很好的理解。 准确了解焦耳热非常重要，因为它占全球热层能量预算的 10%，并且是确定全球温度、风、成分纬度梯度以及 F 区电子密度的主要因素。 提案者将使用热层电离层电动力环流模型（TIEGCM）和电离层电动力学同化绘图（AMIE）技术来研究全球电导率和焦耳热的时空形态及其影响。 焦耳热的详细研究是一个难题，涉及复杂的建模技术和多个数据集的分析，这超出了单个研究者的能力范围。 提案工作需要团队合作，提案团队由各自领域的知名专家组成。 所提出的研究对于详细了解热层-电离层-磁层耦合至关重要。 这项研究与各种国家计划直接相关，例如 CEDAR、太空天气计划和 NASA/TIMED 任务。 高中生将通过 SwRI 的指导计划参与这项工作。