VHF雷达空域干涉法探测曲靖电离层E区场向不规则体精细结构

针对VHF相干散射雷达传统观测方式的探测能力局限，构建了空域干涉法探测实验系统，其具备对电离层场向不规则体（field-aligned irregularity, FAI）三维精细结构探测能力.结合曲靖E区FAI干涉探测实验数据，实现了对系统相位偏差校正及回波三维空间位置精确获取，得到了不规则体云团的三维精细结构以及漂移运动过程，包括FAI回波散射点的三维空间位置以及FAI云团的三维空间外尺度、漂移运动轨迹和漂移速度等.探测实例结果表明：其东西、南北和高度向分布范围分别为-35～20 km、85～120 km和95～130 km，对应的三维外尺度分别为23.8 km、7.6 km和7.6 km；东西向漂移速度要大于其他两个方向，并呈现出5～6 min的准周期回波特征.

Fine structure of ionospheric E-region field-aligned irregularities revealed using the Qujing VHF radar spatial interferometry

Aiming at the limitation of detection ability of VHF coherent scattering radar in routine mode, a detection system based on interference method is constructed to form the detection ability of three-dimensional fine structure of ionospheric E region field-aligned irregularity (FAI) in this work. Based on E region FAI echo data obtained by VHF radar interference detection experiment carried out at Qujing, the phase deviation of detection system is calibrated and the three-dimensional fine structure and drift motion process of E region FAI are obtained. It includes the three-dimensional position of the FAI echo scattering point and the three-dimensional outer scale of the FAI cloud cluster, drifting trajectory and drifting velocity, etc. Observed results show that the east-west, north-south and altitude ranges of E region FAI structure are within ?35?20 km, 85?120 km and 95?130 km, respectively, and the corresponding three-dimensional outer scales are 23.8 km, 7.6 km, and 7.6 km, respectively. The drift velocity in the east-west direction is greater than that in other directions. Quasi-periodic echoes with the period of 5?6 min are also presented in this study. It completely and accurately reveals the spatiotemporal evolution process of FAI in the E region from generation to disappearance.