GEM: Identifying Impact of the Coupling to Ionosphere-Thermosphere on the Near-Earth Electric Fields and Currents

GEM：确定电离层-热层耦合对近地电场和电流的影响

• 批准号: 1103149
• 负责人: Naomi Maruyama
• 金额: $ 23.39万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-05-15 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1103149&HistoricalAwards=false
• 关键词: GEM; Identifying; Impact; Coupling; Ionosphere

This is a three-year project to carry out a data analysis and modeling study of the electromagnetic coupling between the Earth?s magnetosphere and the ionosphere-thermosphere system of its extended atmosphere. The mid-latitude ionosphere is a complicated overlap region of processes initiated at high and low latitudes, with each playing a dominant role in the electrodynamics at different times depending on the current level of geomagnetic activity, as well as the pre-conditioning of the system. The overarching goal of this effort is to advance understanding of the physics of the magnetosphere-ionosphere coupling in this region by addressing a number of specific outstanding science questions: 1) how ionospheric conductance and neutral winds affect ring current dynamics and penetration electric fields, 2) how ionospheric conductance and neutral winds impact current closure between the ring current and the ionosphere that drive sub-auroral plasma flows, and 3) mechanisms of corotation lag in the plasmasphere. A framework of models that self-consistently couples the ionosphere-thermosphere with the inner magnetosphere and ring current will be utilized. This capability was recently developed by the proposing team. It will be complemented through this effort by a component that allows for direct comparisons with a large, diverse set of ground-based and satellite measurements, including observations from the newly established mid-latitude radar stations of the SuperDARN network and the newly available global observations of near-Earth magnetic field variations provided by the AMPERE project. The project will foster extended collaborations between the proposing team of modelers and the many NSF supported community facilities providing the multitude of observational data that will be utilized for this study. This will help demonstrate the versatility of these measurements

这是一个为期三年的项目，进行数据分析和建模研究的电磁耦合之间的地球？的磁层及其扩展大气的电离层-热层系统。 中纬度电离层是一个复杂的重叠区域，由高纬度和低纬度启动的过程组成，根据目前的地磁活动水平以及系统的预处理情况，在不同的时间，每个过程在电动力学中发挥主导作用。这项工作的首要目标是通过解决一些具体的悬而未决的科学问题来促进对该地区磁层-电离层耦合物理学的理解：1）电离层电导和中性风如何影响环电流动力学和穿透电场，2）电离层电导和中性风如何影响环电流和电离层之间驱动极光下等离子体流的电流闭合，（3）等离子体中的共转滞后机制。 将利用一个自洽地将电离层-热层与内磁层和环电流耦合起来的模型框架。 该功能是提案团队最近开发的。 通过这一努力，将有一个组成部分作为补充，以便能够与大量不同的地面和卫星测量数据进行直接比较，其中包括超级DARN网络新建立的中纬度雷达站的观测数据和AMPERE项目提供的新的近地磁场变化全球观测数据。 该项目将促进提议的建模团队与许多NSF支持的社区设施之间的扩展合作，提供将用于本研究的大量观测数据。 这将有助于证明这些测量的通用性