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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Effect of Disturbance Electric Fields on Equatorial Electrojet Over Indian Longitudes
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Effect of Disturbance Electric Fields on Equatorial Electrojet Over Indian Longitudes

机译：干扰电场的影响赤道电喷流在印度的经度

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摘要

Prompt penetration (PP) and ionospheric disturbance dynamo (Ddyn) are two expressions of the disturbed electric field developed during a geomagnetic storm in the Earth's ionosphere. Earlier investigations treated these two processes independently over longitudinal separation beyond 20°. In the present study, we investigate the conjunction of these phenomena on equatorial electrojet at 20° longitude separations using daytime magnetic field data from three equatorial sites viz., Minicoy, Vencode, and Campbell Bay and three low-latitude sites viz., Alibag, Hyderabad, and Nabagram, located within 20° longitude over Indian region, during three intense storms (Dst < -150 nT). We propose a statistical method to identify PP signatures from large data set. In addition, we distinguish the signatures of PP and Ddyn during early recovery phase of intense storms and compute pure Ddyn signature in the late recovery phase. It is seen that the effect of PP is similar at the three equatorial sites for each storm. We find that signatures of Ddyn are amplified at Minicoy and Vencode compared to Campbell Bay, and their magnitude decreases toward low-latitude stations, also reflected in the current vector patterns. Our investigations of intense geomagnetic storms show that PP effect dominates the main phase, followed by a combined effect of PP and Ddyn in the early recovery phase. Eventually the Ddyn signature dominates in the late recovery phase with decreasing amplitudes of Ddyn with increasing time. Such investigations can provide new information about variations in ionospheric parameters.
机译：迅速渗透(PP)和电离层发电机(Ddyn)是两个表达式的干扰干扰电场在发展在地球电离层的磁暴。早些时候的调查这两个处理独立进程在纵向分离超过20°。研究这些现象的结合赤道电喷流在20°经度使用白天磁场数据分离从三个赤道网站即Minicoy,Vencode,坎贝尔湾和三个低纬度位于20°经度对印度地区,在三种强烈的风暴(Dst < -150元)。提出一种统计方法识别页签名从大型数据集。区分PP和Ddyn的签名强烈的风暴和早期恢复阶段计算纯Ddyn签名在复苏阶段。类似的三个赤道网站的每一个风暴。放大在Minicoy Vencode相比坎贝尔湾,和他们的大小减少对低纬度站,也反映在当前矢量模式。强烈的磁暴显示页的效果占主导地位的主要阶段,随后的总和PP和Ddyn早期恢复的效果阶段。和减少后期恢复阶段振幅的Ddyn增加时间。调查可以提供新的信息电离层参数的变化。

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