Analysis and Studies of Radio Tomographic Data Taken at a Low Latitude Chain of Stations

低纬度站链无线电断层摄影数据的分析与研究

• 批准号: 9713435
• 负责人: K. Yeh
• 金额: $ 10万
• 依托单位: University of Illinois at Urbana-Champaign
• 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: 1998-01-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9713435&HistoricalAwards=false
• 关键词: Analysis; Studies; Radio; Tomographic; Data

Tomographic techniques, applied to ionospheric imaging, have provided many simulation studies to learn the nature of artifacts when reconstructions are based on imperfect data. Scientists have also developed techniques to use subsidiary ionospheric information to increase the accuracy of reconstructions. Finally, validation measurements have enhanced confidence in these tomographic techniques. These data, though, have been obtained mainly in campaign mode; hence, they aren't suitable for long-term behavior studies, needed to improve understanding of ionospheric weather. One chain, known as the Low-latitude Ionospheric Tomography Network (LITN), covers the whole northern equatorial anomaly region. The PI now gleans a set of LITN data, showing prominently the equatorial anomaly. This feature, changing day by day, moves to a lower geomagnetic latitude with altitude, demonstrating typical equatorial ionospheric weather. The anomaly is tied intimately to the dynamo electric field through a fountain effect, so the PI can also study this phenomenon. In all, mining the LITN database is enhancing understanding of equatorial region ionospheric weather.

应用于电离层成像的层析成像技术提供了许多模拟研究，以了解重建基于不完美数据时的伪影性质。科学家们还开发了利用辅助电离层信息来提高重建精度的技术。最后，验证测量增强了人们对这些断层扫描技术的信心。然而，这些数据主要是在战役模式下获得的；因此，它们不适合于长期行为研究，而长期行为研究需要改善对电离层天气的理解。其中一个链被称为低纬电离层层析成像网络(LITN)，覆盖了整个赤道北部异常区域。PI现在收集了一组LITN数据，突出地显示了赤道异常。这一特征日新月异，随高度向地磁低纬度移动，表现出典型的赤道电离层天气。这种异常通过喷泉效应与发电机电场密切相关，因此PI也可以研究这一现象。总之，挖掘LITN数据库有助于加深对赤道地区电离层天气的了解。