The solar rotation period is the most prominent mid-term periodicity in the temporal behaviour of solar, heliospheric, and geomagnetic parameters. It is also a cause of the repeatedly appearing geomagnetic storms originating from the corotating interaction regions (CIRs). Since geomagnetic CIR-driven storms have a natural periodic character, and geomagnetic storms impact energy infrastructure via geomagnetically induced currents, it is of interest whether this periodic character is also noticeable in the temporal behaviour of electrical-grid failures (EGFs), which, at least to some extent, might be of solar origin.

中文翻译：

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空间天气效应中的太阳自转倍数

太阳自转周期是太阳、日光层和地磁参数时间行为中最突出的中期周期性。这也是导致来自共转相互作用区（CIR）的地磁暴反复出现的原因。由于地磁 CIR 驱动的风暴具有自然周期性特征，并且地磁风暴通过地磁感应电流影响能源基础设施，因此这种周期性特征在电网故障 (EGF) 的时间行为中是否也很明显是很有趣的，其中，至少在某种程度上，可能源自太阳。