High-Rate Precipitation Occurrence Modulated by Solar Wind High-Speed Streams

Atmosphere

Vojto Rušin¹  Emil A. Prikryl²  Paul Prikryl³ 

[1] Astronomical Institute, Slovak Academy of Sciences, SK-059 60 Tatranská Lomnica, Slovakia;Northern Ontario School of Medicine, Thunder Bay, ON P7B 5E1, Canada;Physics Department, University of New Brunswick, Fredericton, NB E3B 5A3, Canada;

关键词: precipitation;    flash floods;    solar wind high-speed streams;    atmospheric gravity waves;    tropospheric convection;   

DOI  :  10.3390/atmos12091186

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown