In this paper, we investigate the latitudinal and longitudinal variations of the disturbance ionospheric current during 12 geomagnetic storms with Dst ranging between −50 and −130 nT. For this purpose, data from 15 geomagnetic stations along three longitudinal sectors at 70°E, 77°E, and 93°E, ranging from middle to equatorial latitudes in both hemispheres are analyzed. Our study reveals the pattern of PP in the different phases of the storm and the competing effects of PP and Ddyn during the recovery phase of the storms. The PP signatures are mainly comparable across longitudes, irrespective of the strength and phase of the storm. The effect of Ddyn shows a seasonal pattern, which is influenced by the strength of the storm. The location of the antifoci during each storm shows latitudinal variability.

中文翻译：

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电离层扰动电流的空间变化-由12次地磁风暴推断

在本文中，我们研究了Dst范围在-50和-130 nT之间的12次地磁风暴期间干扰电离层电流的横向和纵向变化。为此，分析了两个半球从中纬度到赤道纬度在70°E，77°E和93°E的三个纵向扇区沿15个地磁站的数据。我们的研究揭示了风暴不同阶段的PP模式以及风暴恢复阶段PP和Ddyn的竞争效应。PP签名主要在经度上是可比较的，与风暴的强度和阶段无关。Ddyn的影响表现出季节性模式，受风暴强度的影响。在每次暴风雨期间，抗震源的位置都显示出纬度变化。