Studies of Plasma Structure in the Ionosphere Using Scintillation and Tomographic Techniques

我们建议使用两种技术来研究电离层等离子体结构：层析技术和闪烁技术。以下是每种方法的总结。1.层析成像技术：我们过去几年的模拟研究，以及其他人的几项研究，已经证明了从几十公里到数百公里的水平尺度电离层结构成像的潜力和能力。我们建议建立一个台站网络，以接收来自导航卫星NNSS的多普勒频移信号，以便利用层析成像技术对赤道电离层成像，以了解赤道异常区域的动力学。该项目的相关任务包括修理和改装捐赠的JMR大地经纬仪、开发低成本的基于PC的数据采集系统、在选定的实地地点开发接收器、数据管理和处理、进一步开发计算机算法和数据解释。2.闪烁技术：这个项目涉及分析已经在地球物理感兴趣的不同地点收集的闪烁数据。有一个台站(斯皮茨卑尔根，77.00oN，15.55o，地磁倾角73.43oN)为极点台站。用闪烁技术观测到的小结构可能与极光的存在、行星际磁场的配置、电磁遗漏等有关。在太平洋-亚洲地区，我们收集了一个台网的数据，分析了闪烁与行进电离层扰动的关系。在赤道，闪烁数据可以与雷达数据相关联，以研究电离层运动和小电离层结构产生之间的关系。

We propose to investigate the ionospheric plasma structures using two techniques: tomographic technique and scintillation technique. Each is summarized in the following. 1. Tomographic technique: Our simulation studies over the past several years, as well as several studies by others, have demonstrated the potential and capability of imaging ionospheric structures of horizontal scales from tens of kilometers to hundreds of kilometers. We propose to set up a network of stations to receive Doppler shifted signals from the navigation satellites NNSS for the purpose of imaging the equatorial ionosphere using the tomographic technique to learn about the dynamics of the equatorial anomaly region. This project has associated tasks in repair and modification of donated JMR geodetic TRANSIT receivers, development of a low-cost PC based data acquisition system, development of receivers at selected field sites, data management and processing, further development of computer algorithm, and data interpretation. 2. Scintillation technique: This project is concerned with analyzing already collected scintillation data at various sites of geophysical interests. One station (Spitzbergen, 77.00oN, 15.55o, geomagnetic dip 73.43oN) is a polar cusp station. The small structures observed by the scintillation technique can be related to the presence of auroras, the configuration of the interplanetary magnetic field, electromagnetic omissions, etc. In the Pacific-Asia region data from a network of stations have been collected to analyze the relation of scintillation with the traveling ionospheric disturbances. At equator the scintillation data can be correlated with the radar data to investigate the relation between ionospheric motions and the production of small ionospheric structures.