2026-04-13 20:46:02
Extremely active Sun from 1190 to 1220 in the Medieval Period - intercomparison of historical records and tree-ring carbon-14: #SpaceWeather: https://www.oist.jp/news-center/news/2026/4/10/medieval-japanese-poetry-and-buried-trees-help-elucidate-volatile-space-weather - combining carbon-14 measurements taken at the highest level of precision with historical literature lays a new foundation for studying unpredictable and hazardous solar proton events.

















