基于多仪器观测的中国中纬区域MSTID长距离传播事件研究

Research on Long-distance MSTID Event Observed by Multi-instruments over Mid-latitude Regions of China

电离层等离子体不规则结构通常会影响星地卫星的通信、导航及定位等,因此研究不规则体的结构特征和演化过程具有非常重要的科学意义和应用价值。中尺度电离层行进式扰动(MSTID)是一种常发于F层的电离层扰动,其演化过程十分复杂。本文利用伊春和兴隆台站全天空气辉成像仪、Swarm卫星、佳木斯高频雷达以及漠河和十三陵台站数字测高仪观测数据,对2018年10月17日夜间出现在中国东北区域上空的MSTID事件进行分析。该MSTID事件传播时间较长,在气辉观测中持续时间超过4 h(12:02-16:23 UT),其波长范围为176.3~322.5 km,波速范围为67.0~154.1 m·s^(–1)。研究结果显示,该MSTID可能产生于较高的纬度,自东北向西南往中纬传播,依次经过伊春和兴隆台站的气辉观测区域。

Ionospheric plasma irregularities have always been one of the research focuses in space physics.These irregularities usually have impacts on satellite communication,navigation as well as positioning system.It is of great importance to study the morphological features and the evolutions of these ionospheric irregularities.Medium Scale Travelling Ionospheric Disturbance(MSTID)is one kind of irregularities which usually be wave-like perturbations of the ionospheric plasma in the F-region.The evolution of mid-latitude MSTID is complicated,especially over China.In recent years,with the rapid development of the Chinese Meridian Project and the All-sky Imager Observation Network,more and more instruments have been added to the study of the ionosphere over China.This paper reports a long-distance propagating MSTID event over northeastern China on the night of 17 October 2018.The MSTID were simultaneously observed by multi-instruments,including the all-sky imager,Swarm satellites,High-frequency radar as well as Digisonde.The MSTID lasted for more than 4 hours(12:02-16:23 UT)in the field view of the airglow imager,showing typical wavelength,the phase velocity of 176.3~322.5 km,67.0~154.1 m·s^(–1).The MSTID event was possibly generated at high latitude and propagated southwest-ward to the lower latitude,which was observed by the all-sky imagers in Yichun and Xinlong stations.