A rare minor sudden stratospheric warming is observed in the Antarctic polar region during September 2019, which results in the enhancement of a westward wavenumber 1 quasi‐6‐day wave (Q6DW) in the mesopause region. The impacts of this Q6DW event to the ionosphere are then comparatively investigated with multiple data sets, including the ground‐based total electron content (TEC) from geostationary BeiDou satellite receivers and F2 layer maximum frequency (foF2) from ionosondes ranging from 20 to 40°N over eastern Asia. Besides, the global TEC maps from the International Global Navigation Satellite Systems Service (IGS) are also utilized to study the longitudinal variations. The ground‐based TEC and foF2 observations clearly shows planetary wave (PW) signals with a similar period as those in the mesosphere, which are further verified to be westward with zonal wavenumber 1 by IGS TEC maps. The ground‐based TEC and foF2 also show that the peak of the ionospheric response is at around 1,200–1,400 LT and 25°N over eastern Asia with maximum amplitudes of ∼9 TECU and ∼1.5 MHz, respectively, which are also well captured by IGS TEC maps. Nevertheless, the wave amplitudes exhibited by ground‐based TEC are 2–3 times larger than that in IGS TEC. Besides, the IGS TEC map shows that the ionospheric oscillations at different longitudes peak in the equatorial ionospheric anomaly crest region at similar solar local time, but with significant variabilities in their amplitude. Our analysis shows that the ground‐based ionospheric observations and IGS TEC maps generally exhibit consistent latitudinal structures on the neutral‐ion coupling through PWs.

中文翻译：

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2019年南极SSW事件中电离层对行星波的响应的多元分析

2019年9月，在南极极地地区发生了罕见的平流层突然突然变暖，这导致了更年期区域中向西的波数1准6天波（Q6DW）的增强。然后使用多个数据集比较地研究了Q6DW事件对电离层的影响，包括对地静止北斗卫星接收器的地面总电子含量（TEC）和电离声探仪在20至40°范围内的F2层最大频率（foF2） N在东亚上空。此外，还利用了国际全球导航卫星系统服务（IGS）提供的全球TEC图来研究纵向变化。地面TEC和foF2观测清楚地显示了行星波（PW）信号，其周期与中层周期相似，通过IGS TEC图进一步证实其在1号纬向波是向西的。地面TEC和foF2还表明，东亚地区电离层响应的峰值约为1200–1,400 LT和25°N，最大振幅分别为〜9 TECU和〜1.5 MHz，也能很好地被捕获IGS TEC地图。但是，地面TEC所显示的波幅是IGS TEC的2-3倍。此外，IGS TEC图显示，在相似的太阳当地时间，不同经度的电离层振荡在赤道电离层异常波峰区域达到峰值，但幅度却存在很大差异。我们的分析表明，基于地面的电离层观测和IGS TEC图通常在通过PW耦合的中性离子上表现出一致的纬度结构。