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

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

*Hiroko Miyahara¹, Toshio Terasawa², Ryuho Kataoka³, Mitsuteru Sato⁴, Yukihiro Takahashi⁴ (1.Humanities and Sciences/Museum Carriers, Musashino Art University, 2.RIKEN, 3.National Institute of Polar Research, 4.Hokkaido Univ.)

Keywords:

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.