Medieval Writings and Tree Rings Helped Researchers Track a Solar Storm From 800 Years Ago and Reconstruct Past Solar Cycles

https://www.oist.jp/news-center/news/2026/4/10/medieval-japanese-poetry-and-buried-trees-help-elucidate-volatile-space-weather
Red aurora over Engaru, Hokkaido, Japan -  Early morning, August 13, 2024  
© Tomohiro M. Nakayama (CC-BY-NC)

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