＜２０１１/２/２１〜３/１５＞

＜２０２４/０４/２〜４/２８＞

＜２０１８〜２０２４＞

＜Trends in solar activity and COVID-19 cases in Japan＞

＜Changes in solar activity and the number of COVID-19 deaths in Japan＞

ＨＯＭＥ＞＞