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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >F-lacuna at cusp latitude and its associated TEC variation
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F-lacuna at cusp latitude and its associated TEC variation

机译：在尖端F-lacuna纬度及其相关的侦探变异

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摘要

As a frequent phenomenon occurring during summer days in high-latitude ionosphere, the F-lacuna manifests itself as disappearance of F region ionogram traces. Based on the 7.5 min interval Digisonde ionograms recorded at Zhongshan station (69.4°S, 76.4°E geographic coordinates; 74.5°S, 96.0°E corrected geomagnetic coordinates), we present temporal characteristics of the F-lacuna, as well as its correlation with geomagnetic activity, interplanetary magnetic field, and colocated TEC. Magnetic Local Time(MLT) distribution of the F-lacuna occurrence exhibits a dawn-dusk asymmetry. All types of F-lacuna favor the dawn sector, mainly occurring at 08:00–11:00MLT for F1 and total lacuna, 6:00–8:00MLT for F2-lacuna. The magnetic activity is found to have a strong positive correlation with the F2 and total lacuna. F2-lacuna occurrence is favored by southward component of interplanetary magnetic field (IMF), and total lacuna by high values of either eastward or westward component. It is worth to mention that the F-lacuna associates with the simultaneous total electron content (TEC) condition which has a positive correlation with F1-lacuna occurrence, while a strong negative correlation with the F2 and total lacuna. The associated TEC variation may provide a significant evidence for interpreting the F-lacuna phenomenon.
机译：频繁的现象发生在夏季天在高纬度地区电离层,F-lacuna表现为F地区的消失电离图的痕迹。在中山车站Digisonde电离图记录(69.4°S, 76.4°E地理坐标;96.0°E纠正地磁坐标系),我们现在时态F-lacuna特点,以及它与地磁相关活动,行星际磁场,托管的侦探。分布F-lacuna发生展品一个dawn-dusk的不对称。黎明支持部门,主要发生在08:00-11:00MLT F1和总腔隙,6:00-8:00MLT F2-lacuna。发现有很强的正相关关系F2和总腔隙。发生是向南的组成部分行星际磁场(IMF),总向东或腔隙的高值西组件。同时F-lacuna associates总电子含量(TEC)条件与F1-lacuna出现正相关,而与F2强烈的负相关和总腔隙。可以提供重要的证据吗解读F-lacuna现象。

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