2019年12月8日中国低纬区域电离层行扰事件传播演化过程
doi: 10.11728/cjss2026.05.2025-0221 cstr: 32142.14.cjss.2025-0221
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罗吉 女, 1993年8月出生于湖南省邵阳市, 现为长沙理工大学专任教师, 硕士生导师, 主要研究方向为中电离层不规则体、中高层大气等. E-mail: llluoji@126.com -
吴坤 男, 1989年12月出生于云南省昆明市, 现为长沙理工大学专任教师, 硕士生导师, 主要研究方向为中低纬电离层等. E-mail: kunwu1220@163.com
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刘斯 女, 1984年3月出生于湖南省新化县, 现为长沙理工大学教授, 博士生导师, 主要研究方向为等离子体物理、空间等离子体波动等. E-mail: liu.si@hotmail.com
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Propagation and Evolution of MSTIDs over the Low-Latitude Region of China during 8 December 2019
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摘要: 利用子午工程富克台站(19.5°N, 109.1°E)气辉成像仪观测数据、数字测高仪探测数据、北海台站(21.7°N, 109.2°E) GPS(Global Positioning System)-TEC(Total Electron Content)探测数据及TIE-GCM(Thermosphere-Ionosphere-Electrodynamics General Circulation Model)模拟数据, 对中国低纬区域2019年12月8日富克台站上空的夜间中尺度电离层行进式扰动(Medium-scale Travelling Ionospheric Disturbances, MSTIDs)事件进行了研究. 结果表明, 在夜间中国低纬区域上空观测到典型的北半球MSTID结构, 其相平面呈西北–东南分布的明暗相间条带, 向西南方向传播. 在传播过程中, MSTIDs两条暗条带发生了追赶现象, 后出现在观测视野中的暗条带追赶上了先出现的暗条带. 利用TIE-GCM模型模拟了夜间背景风场与电子密度分布, 模拟结果显示, 电离层背景纬向风场梯度差异与低纬区域赤道电离异常区高密度电子密度分布的协同作用是调控此次MSTIDs发生追赶过程的主要原因. 本研究为不均匀的中性风场以及电子密度分布对MSTIDs传播特征的影响提供了理论依据.Abstract: This study investigates a nighttime medium-scale traveling ionospheric disturbance (MSTID) event observed over Fuke Station (19.5°N, 109.1°E) in low-latitude China on 8 December 2019, using airglow imaging and Digisonde observations from the Chinese Meridian Project’s Fuke Station, Global Positioning System (GPS) total electron content (TEC) measurements from Beihai Station (21.7°N, 109.2°E), and simulations from the Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM). The observations reveal typical northern hemisphere nighttime MSTID structures, characterized by alternating bright and dark bands with northwest–southeast-oriented bands propagating southwestward. During the propagating process, two dark bands exhibited a chasing phenomenon, in which the band that entered the field of view later caught up with the preceding band. The TIE-GCM was used to simulate the nighttime background neutral wind and electron density distribution. The simulation results suggest that the combined effects of spatial variations in the background zonal wind gradient and enhanced electron densities within the low-latitude equatorial ionization anomaly region were primarily responsible for regulating this chasing process. This study provides a theoretical basis for understanding how spatially nonuniform neutral winds and electron density distributions influence MSTID propagation.
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图 1 2019年12月8日富克台站气辉观测结果 (数字1, 2, 3是根据暗条带进入气辉观测视野的先后顺序, 五角星代表富克观测站地理位置)
Figure 1. Airglow observations at Fuke station on 8 December 2019 (Number1,2,and 3 are assigned according to the sequence where the dark bands enter the airglow field of view, and the red pentagram represents the geographic location of the Fuke Station)
图 2 2019年12月8日GPS-TEC与气辉同时观测结果. (b)中曲线对应(a)中相同颜色的轨道轨迹
Figure 2. Simultaneous observation results of GPS-TEC and airglow on 8 December 2019. Colored curves in chart (b) match the same -colored obital trajectories in chart (a)
图 3 2019年12月8日富克台站数字测高仪观测结果
Figure 3. Digisonde observations at Fuke Station on 8 December 2019
图 4 TIE-GCM模拟的2019年12月8日02:00－05:40 LT 100°E－120°E, 11.5°N－27.5°N区域250 km高度纬向风
Figure 4. Zonal wind at 250 km altitude from TIE-GCM simulation for the region by 100°E－120°E and 11.5°N－27.5°N at 02:00－05:40 LT on 8 December 2019
图 5 TIE-GCM模拟的2019年12月8日02:00－05:40 LT 100°E－120°E, 11.5°N－27.5°N区域250 km高度经向风
Figure 5. Meridional wind at 250 km altitude from TIE-GCM simulation for the region by 100°E－120°E and 11.5°N－27.5°N at 02:00－05:40 LT on 8 December 2019
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