講演情報
[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)
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.