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Space Weather: Global Semi-Empirical Equatorial Electrodynamic and Spread-F Model

空间天气：全球半经验赤道电动力和 Spread-F 模型

基本信息

批准号：
9613953
负责人：
Bela Fejer
金额：
$ 2.91万
依托单位：
Utah State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1996
资助国家：
美国
起止时间：
1996-09-15 至 1998-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9613953&HistoricalAwards=false
关键词：
Space Weather Global Semi Empirical

项目摘要

The PIs will use extensive measurements and numerical modeling to study the generation and evolution of spread-F irregularity and scintillation phenomena, and obtain a global semi-empirical equatorial electrodynamic and spread-F model with predictive capabilities. Using Jicamarca incoherent radar, global ionosonde and satellite measurements the investigators will determine the initial electrodynamic conditions for spread-F. Their radar data set will determine the height dependent ambient electrodynamic conditions immediately prior to the occurrence of spread-F, the location of the initial unstable layer, and its temporal and spatial evolution for different seasons and flux conditions. Height gradients in the vertical and zonal plasma drifts in the bottomside and topside of the F layer may play important roles in the generation and evolution of equatorial spread-F. Additionally, the PIs will use extensive ionosonde and satellite data to determine the role of meridional neutral winds and magnetic declination effects, and extend the model to different longitudinal sectors. Finally, they will combine the Jicamarca radar drift model, the AE-E satellite model and ionosonde observations with the storm time electric field model at Utah State and the GTIM to obtain the first global equatorial electrodynamic and spread-F model.

PI将使用广泛的测量和数值模拟来研究扩展F不规则性和闪烁现象的产生和演变，并获得具有预测能力的全球半经验赤道电动力学和扩展F模型。利用Jicamarca非相干雷达，全球电离层探测仪和卫星测量，研究人员将确定扩展F的初始电动条件。他们的雷达数据集将确定在扩展F发生之前的高度相关环境电动力学条件、初始不稳定层的位置及其在不同季节和通量条件下的时间和空间演变。 F层顶、底侧等离子体垂直漂移和纬向漂移的高度梯度对赤道扩展F的产生和演化起着重要作用。此外，PI将使用广泛的电离层探测仪和卫星数据来确定纬向中性风和磁衰减效应的作用，并将模型扩展到不同的纵向扇区。最后，他们将把Jicamarca雷达漂移模型、AE-E卫星模型和电离层探测仪观测结果与犹他州和GTIM的风暴时间电场模型相结合，以获得第一个全球赤道电动力学和扩展F模型。