Interplanetary (IP) shocks drive magnetosphere‐ionosphere (MI) current systems that in turn are associated with ground magnetic perturbations. Recent work has shown that IP shock impact angle plays a significant role in controlling the subsequent geomagnetic activity and magnetic perturbations; for example, highly inclined shocks drive asymmetric MI responses due to interhemispherical asymmetric magnetospheric compressions, while almost head‐on shocks drive more symmetric MI responses. However, there are few observations confirming that inclined shocks drive such asymmetries in the high‐latitude ground magnetic response. We use data from a chain of Antarctic magnetometers, combined with magnetically conjugate stations on the west coast of Greenland, to test these model predictions (Oliveira & Raeder, 2015, https://doi.org/10.1002/2015JA021147; Oliveira, 2017, https://doi.org/10.1007/s13538-016-0472-x). We calculate the time derivative of the magnetic field ( ) in each hemisphere separately. Next, we examine the ratio of Northern to Southern Hemisphere intensities and the time differences between the maximum immediately following the impact of IP shocks. We order these results according to shock impact angles obtained from a recently published database with over 500 events and discuss how shock impact angles affect north‐south hemisphere asymmetries in the ground magnetic response. We find that the hemisphere the shock strikes first usually has (1) the first response in and (2) the most intense response in . Additionally, we show that highly inclined shocks can generate high‐latitude ground magnetic responses that differ significantly from predictions based on models that assume symmetric driving conditions.

中文翻译：

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行星际撞击对地面磁响应的半球不对称：冲击角的作用

行星际（IP）冲击驱动了磁层-电离层（MI）电流系统，而这些系统又与地面磁扰动有关。最近的工作表明，IP冲击角在控制随后的地磁活动和磁扰动中起着重要作用。例如，由于半球间不对称的磁层压缩，高度倾斜的冲击会驱动不对称的MI响应，而几乎正面冲击会驱动更对称的MI响应。但是，几乎没有观察结果证实倾斜冲击会导致高纬度地面磁响应中的这种不对称性。我们使用来自南极磁力计链的数据与格陵兰岛西海岸的磁共轭站相结合来检验这些模型预测（Oliveira＆Raeder，2015，https://doi.org/10.1002/2015JA021147; 奥利维拉（Oliveira），2017年，https：//doi.org/10.1007/s13538-016-0472-x）。我们计算磁场的时间导数（ ）分别放在每个半球中。接下来，我们检查北半球和南半球强度的比率以及紧接IP冲击后最大值之间的时间差。我们根据从最近发布的数据库中获得的500多个事件的冲击角对这些结果进行排序，并讨论冲击角如何影响地面磁响应中的南北半球不对称性。我们发现冲击首先冲击的半球通常具有（1）中的第一个响应和（2）中的最强烈的响应。此外，我们表明，高倾斜震动会产生高纬度地面磁响应，该响应与基于假设对称行驶条件的模型的预测有显着差异。