我国中南地区L波段电波闪烁和Es层中不规则结构的经度变化研究

Scintillation and ionospheric irregularities which can cause scintillation is an important direction in space weather. This application will perform analyses of ground-based GPS scintillation/TEC network measurements and GPS-LEO occultation measurements, to study the statistical characteristics of scintillation of L-band radio waves and drifts of irregularities in the Midlands and South of China, and focuses on the longitudinal variations, formation mechanism and controlling factors of irregularities in Es layer. The following issues will be emphatically studied: (1) the statistical characteristics of ionospheric scintillation in the Midlands and South of China; (2) the effects of scintillation on the performances of GPS satellite links; (3) drift of irregularities and the statistical characteristics of it; (4) longitudinal structure of Es-layer irregularities and its dependence on local time, season and dip latitude; (5) the mechanism and controlling factors for linear growth of plasma instability of generation and evolution of Es-layer irregularities causing scintillation. These researches are of great significance for better understanding of the characteristics of ionospheric irregularities, and have potential application value in fields which involve trans-ionosphere propagations of radio waves, including prediction of disastrous space weather and satellite communication, navigation and positioning.

闪烁与引起闪烁的电离层不规则结构是空间天气研究的重要方向之一。本申请项目拟开展地面GPS闪烁/TEC台网观测分析和GPS-LEO卫星掩星数据分析，目的在于研究我国中南地区电离层L波段电波闪烁活动及不规则结构漂移的统计特征，侧重研究Es层中引起闪烁的电离层不规则结构的经度变化以及引起闪烁的Es层中不规则结构的生成机理和控制因素。着重研究的科学问题包括：(1) 我国中南地区电离层闪烁的统计特征；(2) 闪烁对GPS星-地链路性能的影响；(3) 不规则结构漂移及其统计特征；(4) Es层中不规则结构的经度变化及其随地方时、季节和倾角磁纬的变化；（5）Es层中引起闪烁的不规则结构生成和演化的等离子体不稳定性线性增长的机理和控制因素。研究成果对深入了解电离层不规则结构特性这一基础理论问题有重要的科学意义，对灾害性空间天气预测及卫星通信导航定位等涉及无线电波跨电离层传播问题有潜在的应用价值。

闪烁与引起闪烁的电离层不规则结构是空间天气研究的重要方向之一。本项目开展了地面GPS闪烁/TEC台网观测分析和GPS-LEO卫星掩星数据分析，研究了我国中南地区电离层L波段电波闪烁活动及不规则结构漂移的统计特征，侧重研究了Es层中引起闪烁的电离层不规则结构的经度变化以及引起闪烁的Es层中不规则结构的生成机理和控制因素。包括以下科学问题：(1) 我国中南地区电离层闪烁的统计特征；(2) 闪烁对GPS星-地链路性能的影响；(3) 不规则结构漂移及其统计特征；(4) Es层中不规则结构的经度变化及其随地方时、季节和倾角磁纬的变化；(5) Es层中引起闪烁的不规则结构生成和演化的等离子体不稳定性线性增长的机理和控制因素。研究成果对深入了解电离层不规则结构特性这一基础理论问题有重要的科学意义，对灾害性空间天气预测及卫星通信导航定位等涉及无线电波跨电离层传播问题有潜在的应用价值。