The occurrence characteristics of daytime irregularities in the low latitude F region topside at solar minimum revealed by ICON
The occurrence characteristics of daytime irregularities in the low latitude F region topside at solar minimum revealed by ICON
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ICON揭示的低纬F区太阳活动极小期白天不规则现象的发生特征
DOI：
10.1029/2022ja030957
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Baiqi Ning
中科院分区：
文献类型：
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作者：
Haiyong Xie;Guozhu Li;Xiukuan Zhao;Lianhuan Hu;Wenjie Sun;Yi Li;Baiqi Ning
利用电离层连接探测者卫星的观测资料，研究了太阳活动极小期低纬顶面F区白天等离子体密度不均匀性的发生特征。结果表明，冬至日间顶面不规则的发生特征与太阳活动极大期相似。一个有趣的现象以前没有报道过，当地时间变化的最小值发生在08：30-10：00 LT左右，主要是在亚洲的春分期间。出现在最小值之后的顶面不规则体主要集中在±5° ~ 15 °的低纬度地区。根据来自低纬度地基全球导航卫星系统接收器的总电子含量扰动，发现发生最小值之后的顶部不规则性有时伴随着明显的中等尺度电离层扰动（MSTID）。统计上，一个很好的协议，观察到当地的时间变化的MSTID和白天的上部不规则性在东亚/东南亚春分。我们认为，在低纬顶面F区的白天不规则不完全是夜间赤道等离子体泡的残余。特别是对于亚洲春分日间的异常，它们可能是出现在顶面F区的MSTID。
Using observations from the Ionospheric Connection Explorer satellite, the occurrence characteristics of daytime plasma density irregularities in the low latitude topside F region at solar minimum were studied. The results show that the occurrence characteristics of daytime topside irregularities during June solstice resembled those at solar maximum. An interesting phenomenon not reported before is that an occurrence minimum in the local‐time variation occurred around 08:30–10:00 LT, mainly during Equinox in Asia. The topside irregularities appearing after the occurrence minimum were mostly concentrated at low latitudes around ±5°–15°. Based on the total electron content perturbations derived from the ground‐based global navigation satellite system receivers at low latitudes, it was found that the topside irregularities after the occurrence minimum were accompanied with apparent medium‐scale traveling ionospheric disturbances (MSTIDs) at times. Statistically, a good agreement was observed between the local time variations of MSTIDs and of daytime topside irregularities during Equinox in East/Southeast Asia. We suggest that the daytime irregularities in the low latitude topside F region were not totally the remnants of nighttime equatorial plasma bubbles. Especially for the daytime irregularities during Equinox in Asia, they could be MSTIDs appearing at topside F region.