Extreme weather events, such as heavy rainfall causing floods and flash floods continue to present difficult challenges in forecasting. Using gridded daily precipitation datasets in conjunction with solar wind data it is shown that high-rate precipitation occurrence is modulated by solar wind high-speed streams. Superposed epoch analysis shows a statistical increase in the occurrence of high-rate precipitation following arrivals of high-speed streams from coronal holes, including their recurrence with the solar rotation period of 27 days. These results are consistent with the observed tendency of heavy rainfall leading to floods and flash floods in Japan, Australia, and continental United States to follow arrivals of high-speed streams. A possible role of the solar wind–magnetosphere–ionosphere–atmosphere coupling in weather as mediated by globally propagating aurorally excited atmospheric gravity waves triggering conditional moist instabilities leading to convection in the troposphere that has been proposed in previous publications is highlighted.

中文翻译：

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太阳风高速气流调制的高速降水发生

极端天气事件，例如导致洪水和山洪暴发的强降雨继续给预报带来困难。使用网格化的日降水数据集与太阳风数据相结合，表明高速降水的发生受太阳风高速流的调节。叠加历元分析表明，随着来自日冕洞的高速气流到达，高速降水的发生率在统计上有所增加，包括它们在太阳自转周期为 27 天时的复发。这些结果与在日本、澳大利亚和美国大陆观察到的大雨导致洪水和山洪暴发的趋势是一致的。