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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Occurrence and Characteristics of Traveling Ionospheric Disturbances in the Antarctic Peninsula Region
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Occurrence and Characteristics of Traveling Ionospheric Disturbances in the Antarctic Peninsula Region

机译：南极半岛地区行进电离层扰动的发生及特征

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摘要

A statistical picture of the occurrence and characteristics of Traveling Ionospheric Disturbances (TIDs) over the Antarctic Peninsula is established using Global Navigation Satellite System Total Electron Content and High Frequency sounding observations. The measured parameters of the majority of the disturbances allow classifying them as medium scale TIDs (MSTIDs). Overall, the observed climatology of ionospheric disturbances in the Antarctic Peninsula region varies significantly with the season and makes it possible to differentiate two major types of the disturbances: winter daytime and summer nighttime, based on their occurrence periods and characteristics. During the Antarctic summer period, the disturbances are present mainly during the nighttime and morning hours, when the background plasma density is at maximum (due to Weddell Sea Anomaly). These disturbances predominantly propagate northwestward and their occurrence probability is well correlated with the sporadic E layer observations, suggesting that these are electrified MSTIDs. During the winter, the TID events are almost exclusively observed during the daytime. The propagation direction of the disturbances during the daytime shows a strong correlation with the background neutral wind direction in the thermosphere. A possible mechanism for this effect is wind filtering of the Atmospheric Gravity Waves originating in the troposphere, which indicates that their source is in the lower atmosphere. The periods of the TIDs also significantly differ between the seasons. Wintertime TIDs have noticeably shorter periods (10–50 min) than those observed during other parts of the year (30–140 min), which also likely reflects the fact that the two types of TIDs are generated by different physical mechanisms.
机译：一个统计的发生和照片旅行电离层的特征在南极半岛干扰(tid)建立了使用全球导航卫星系统总电子含量和高频率听起来观察。大多数的干扰分类为中等规模tid (MSTIDs)。总体而言,观察到的气候学的电离层在南极半岛地区的骚乱季节的不同而存在明显的变化,使它主要可以区分两种类型的干扰:冬天白天和夏季夜间,根据他们的发生期和特征。期间,主要的障碍是礼物在夜间和清晨小时,当在最大(由于背景等离子体密度威德尔海异常)。主要向西北方及其传播发生概率相关分散E层观察,建议这些是电气化MSTIDs。冬天,几乎完全TID事件在白天观察到。在白天的方向扰动显示了很强的相关性与背景中性风的方向运转。此作用可能的机制是风过滤的大气重力波原始的对流层,这表明他们的来源是低层大气。时期的tid也显著不同之间的季节。明显比那些短时间(10 - 50分钟)期间观察到的其他部分(30 - 140分钟),也可能反映了事实这两种类型的tid所产生的不同物理机制。

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