[May 14, 1921] The telephone exchange building in Karlstad, Sweden, is destroyed by a fire blamed on solar flares. It's the biggest damage caused this week's sunspot flare-up.
from /r/100yearsago
[1921年5月14日] 瑞典卡尔斯塔德的电话交换机大楼被一场归咎于太阳耀斑的大火摧毁。这是本周太阳黑子耀斑造成的最大破坏。