M-I Coupling: Electric Field Variability in the High-Latitude Ionosphere

M-I 耦合：高纬度电离层中的电场变化

• 批准号: 0202233
• 负责人: Simon Shepherd
• 金额: $ 17.5万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-15 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0202233&HistoricalAwards=false
• 关键词: Coupling; Electric; Field; Variability; Latitude

The investigators will use line-of-sight (LOS) velocity drift measurements from the Super Dual Auroral Radar Network (SuperDARN) to characterize the statistical nature of velocity variability in the high latitude ionosphere. They will use the existing SuperDARN dataset to determine the temporal variability in LOS measurements on 100X45 km spatial scales and 1 minute time scales over the entire high latitude ionosphere. It has been shown that variability in the convection electric field is a significant factor in determining the amount of Joule heating in this region. General circulation models of the thermosphere use statistical or averaged convection electric fields which contain no information about the small-scale variability and thus seriously underestimate the amount of Joule heating. The wide coverage of the SuperDARN radars will allow determination of the relationships between velocity variability and magnetospheric features. The resulting comprehensive characterizations of the electric field variability will facilitate more realistic inputs to global models and better understanding of the magnetosphere-ionosphere system.

研究人员将使用超级双极光雷达网（SuperDARN）的视线（LOS）速度漂移测量值来表征高纬度电离层速度变化的统计性质。 他们将使用现有的SuperDARN数据集来确定整个高纬度电离层100X45公里空间尺度和1分钟时间尺度上LOS测量的时间变化。 它已被证明，在对流电场的变化是一个重要的因素，在确定该地区的焦耳加热量。 热大气层的大气环流模型使用的是统计或平均对流电场，其中不包含关于小尺度变化的信息，因此严重低估了焦耳加热量。 SuperDARN雷达的广泛覆盖范围将有助于确定速度变化与磁层特征之间的关系。 由此产生的电场变化的全面表征将有助于更现实的输入到全球模型和更好地了解磁层电离层系统。