| 夏季强对流活动对东亚低纬电离层不规则体影响的事件分析 |
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| 引用本文： | 尚社平,史建魁,程征伟,王国军,王铮,王霄.夏季强对流活动对东亚低纬电离层不规则体影响的事件分析[J].空间科学学报,2022,42(6):1111-1121. |
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| 作者姓名： | 尚社平 史建魁 程征伟 王国军 王铮 王霄 |
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| 作者单位： | 中国科学院国家空间科学中心 空间天气学国家重点实验室 北京 100190 |
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| 基金项目： | 国家自然科学基金项目（41474136, 42074201）和中国科学院稳定支持基础研究领域青年团队计划项目（YSBR-018）共同资助 |
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| 摘 要： | 利用海南台站和东南亚地区的多种地基和天基观测手段，对2014年7月28日夜间观测到的东亚低纬F区不规则体事件的时空变化及其物理过程进行分析。结果表明，海南台站观测到了罕见的长时间持续的F区电离层不规则体，不同手段观测到的电离层不规则体存在明显的形态差异。不同台站观测到的电离层不规则体活动存在明显的差异。海南台站经度区南北异常峰附近的TEC起伏活动在日落后至午夜附近明显增强，在午夜后明显减弱。C/NOFS卫星轨迹午夜后逐渐接近于磁赤道，且处于较低高度上，几乎总会观测到弱等离子体扰动/泡的发生，与该区域地基观测的弱电离层不规则体活动存在明显的联系。SWARM卫星在黎明海南台站附近经度区仍观测到较强的赤道异常双峰结构，且西侧异常峰区附近仍存在明显的等离子体密度耗空/泡结构。海南台站西侧磁赤道区附近（中南半岛）强对流活动（MCC）激发的重力波种子扰动对东亚低纬区等离子体泡及准周期结构的产生发挥了重要作用。
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| 关 键 词： | 东亚低纬区 电离层不规则体 多种观测 夏季 对流层强对流 |
| 收稿时间： | 2021-12-27 |
Event Analysis of the Influence of Strong Tropospheric Convection in Summer on Low-latitude Ionospheric Irregularities in East Asia |
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| Affiliation: | State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy Sciences, Beijing 100190Hainan National Field Science Observation and Research Observatory for Space Weather, Beijing 100190 |
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| Abstract: | Using various ground-based and space-based observation methods from the Hainan station and Southeast Asia, the spatiotemporal changes and physical processes of the irregularity events in the low-latitude F region of East Asia observed on the night of July 28, 2014 were analyzed. The main results are as follows. The Hainan station observed a rare occurrence of long-lasting ionospheric irregularities in the F region, and the ionospheric irregularities observed by different means have obvious morphological differences. There are obvious differences in the activities of ionospheric irregularities observed by different stations. The TEC fluctuation activities near the north-south anomalous peaks in the longitude area of Hainan increased significantly before midnight and weakened significantly after midnight. After midnight, the trajectory of the C/NOFS satellite gradually approached magnetic equator and was at a lower altitude. The occurrence of weak plasma disturbances/bubbles was almost always observed, which is obviously related to the activities of weak ionospheric irregularities observed on the ground in this region. The SWARM satellites still observed the strong two peaks of equatorial anomaly near dawn in the longitude region near Hainan station, and there were still the plasma density depletion/bubble structures near the anomalous peak area on the west side. The seed disturbance (gravity waves) excited by the MCC near the magnetic equator on the west side of the Hainan station (Indochina Peninsula) may play an important role in the generation of plasma bubbles and their quasi periodic structures in the low latitude region of East Asia. |
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