High Frequency Radar Studies of the Very High Latitude Ionosphere

甚高纬度电离层的高频雷达研究

• 批准号: 8713982
• 负责人: Raymond Greenwald
• 金额: $ 35万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1990-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8713982&HistoricalAwards=false
• 关键词: Frequency; Radar; Studies; Very; Latitude

The ionosphere at high latitudes is disturbed by a variety of energy inputs from the magnetosphere, including particle precipitation, electric fields, and the flow of electrical currents, all ultimately originating with the interaction of the solar wind and the outer boundary of the magnetosphere. Ionospheric density irregularities and drifts are present over a wide range of scale sizes and velocities. The deployment of modern radar systems, with sophisticated computer diagnostics and data compression capabilities, allows these irregularities and drifts to be measured as part of a thorough study of the high latitude ionosphere, and provides information for the solution of practical problems associated with radio communication at high latitudes. This award is for continued support of the Johns Hopkins University radar at Goose Bay, Labrador, in conjunction with satellite measurements, other ground based instruments in the area, and a similar radar in Antarctica. The Antarctic radar is at Halley Bay, the magnetic conjugate point, i.e., the place where the magnetic field lines that thread the Goose Bay ionosphere, and extend out many earth radii into the magnetosphere, return to the southern hemisphere ionosphere. The currents, electric fields, and particles from the magnetosphere tend to extend along field lines and be the same at conjugate points, but the differences give important information on the coupling between the magnetosphere and the ionosphere.

高纬度电离层受到来自磁层的各种能量输入的干扰，包括粒子降水、电场和电流的流动，所有这些最终都源于太阳风与磁层外边界的相互作用。 电离层密度不规则性和漂移存在于各种尺度和速度。 现代雷达系统的部署具有先进的计算机诊断和数据压缩功能，可以作为对高纬度电离层彻底研究的一部分来测量这些不规则性和漂移，并为解决与高纬度无线电通信相关的实际问题提供信息。 该奖项是为了表彰拉布拉多古斯湾的约翰·霍普金斯大学雷达与卫星测量、该地区的其他地面仪器以及南极洲的类似雷达的持续支持。 南极雷达位于哈雷湾，即磁共轭点，即穿过古斯湾电离层并延伸许多地球半径进入磁层的磁力线返回南半球电离层的地方。 来自磁层的电流、电场和粒子往往沿着磁力线延伸，并且在共轭点处相同，但这些差异提供了有关磁层和电离层之间耦合的重要信息。