Abstract

The development of two supersubstorms (i.e., very intense substorms with an amplitude of more than 2000 nT) recorded in the main phase of two consecutive strong magnetic storms with maxima at ~0100 UT (Dst ~ –150 nT) and ~1300 UT (Dst ~ –115 nT) on September 8, 2017, is analyzed. Data from the SuperMAG global magnetometers network and the Scandinavian profile of IMAGE stations are used. Analysis of spatial distribution maps of ionospheric equivalent electric currents on the Scandinavian meridian derived according to the MIRACLE model and global maps of magnetic field vectors obtained from SuperMAG observations makes it possible to obtain the spatial distribution of planetary-scale disturbances. Both supersubstorms were characterized not only by strong nighttime disturbances at auroral latitudes (~–3600 nT and ~–2600 nT) but also by the simultaneous development of daytime magnetic bays at polar latitudes with amplitudes of ~–1000 nT and ~–400 nT, respectively. We assume that the daytime polar disturbances observed simultaneously with the supersubstorms can result from the pull of the westward ionospheric current to the dayside. Our observations support the assumption that the westward electrojet during the supersubstorm develops on a global scale from the evening to the dayside.

中文翻译：

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2017年9月7日至8日的暴风雨中的超亚暴

摘要

在两个连续的强磁暴的主要阶段记录了两次超亚暴（即振幅大于2000 nT的非常强烈的亚暴）的发展，其最大峰值为〜0100 UT（Dst〜– 150 nT）和〜1300 UT（Dst〜2017年9月8日）。使用来自SuperMAG全球磁力计网络和IMAGE站的斯堪的纳维亚概况的数据。根据MIRACLE模型导出的斯堪的纳维亚子午线上电离层等效电流的空间分布图以及从SuperMAG观测获得的磁场矢量的全局图的分析，有可能获得行星尺度扰动的空间分布。两次超亚暴的特征不仅在于极光纬度（〜–3600 nT和〜–2600 nT）的强烈夜间干扰，而且还表现在极纬度的〜–1000 nT和〜–400 nT振幅的日间磁性海湾的同时发展，分别。我们假设，与超亚暴同时观测到的白天极地干扰可能是由向西电离层流向白天的拉动引起的。我们的观察结果支持这样的假设，即在超级亚暴期间，向西的电喷从晚上到白天都在全球范围内发展。