[P-EM12] [EE] Space Weather, Space Climate, VarSITI

[PEM12-P20] Solar 27-day rotational period detected in a wide-area lightning activity in Japan

★招待講演

*宮原 ひろ子¹、寺澤 敏夫²、片岡 龍峰³、佐藤 光輝⁴、高橋 幸弘⁴ (1.武蔵野美術大学 教養文化・学芸員課程研究室、2.理化学研究所、3.国立極地研究所、4.北海道大学)

キーワード：Solar forcing of climate, Lightning activity, Solar rotational period

A signal of the 27-day solar rotational period is often observed in cloud and lightning activities over the globe. Here we provide evidence of the 27-day periodicity of lightning activity in Japan using daily observational records of lightning for AD1989–2015. The 27-day period is detected only in a wide-area lightning activity over more than a few hundred thousand square kilometers. The 27-day signal is more prominent around the maxima of solar decadal cycles.