1279 carbon-14 candidate
Brehm et al. 2021 report a rise of 5.0 plus or minus 3.2 permil from 1279 to 1280 in United Kingdom oak. The Wolf Minimum begins about 1280, so solar activity was heading down.
How it connects
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Radiocarbon rise 1279 to 1280: three labs, three sizes
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Korea's violet glow of 25 October 1279 falls in the window for the 1279 to 1280 radiocarbon jump, and the main paper missed it
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The night sky was red, China, 11 September 1277
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Red glow in the south, night as bright as day, Korea, 26 March 1278
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Red vapour across the whole sky, then a red glow bright as day, Korea, 23 and 26 March 1278
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A sunspot as big as a hen's egg, Korea, 31 August 1278
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Violet glow in the west, its light like lightning, Korea, 25 October 1279
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Japanese court diaries: no red or white vapour around 1279
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Fiery beams around the Northern Crown (Corona Borealis), 1280