Urgamla träd avslöjar medeltida solstorm från år 1200

14 maj 2026

Rapporterad av AI

Forskare har funnit bevis för en kraftfull protonhändelse från solen som träffade jorden omkring år 1200 genom att analysera koldioxid-14-toppar i uråldriga japanska träd och jämföra dem med medeltida noteringar om röda norrsken.

Studien, som leddes av forskare vid Okinawa Institute of Science and Technology, identifierade den sub-extrema händelsen till tiden mellan vintern år 1200 och våren år 1201. Forskarna kombinerade extremt precisa koldioxid-14-mätningar från nergrävda asunaro-träd i prefekturen Aomori med historiska skildringar, däribland beskrivningar av röda sken på norra himlavalvet i en japansk dagbok samt liknande rapporter från Kina.

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