this post was submitted on 19 May 2024
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Spoiler - though they were both G5 storms, they weren’t really that comparable.

Also, big as the Carrington Event was, it’s likely it was absolutely dwarfed by one about a millennium ago, the Miyake Event

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[–] [email protected] 7 points 6 months ago (1 children)

Trees!
Trees store lots of environmental and atmospheric data in their trunks. When they get fossilized a lot of that information remains intact.
Also, ice cores. Layers of ice protect previous layers of ice from further contamination, so are a pretty good snapshot of the environment/atmosphere at a given point in time.

https://www.bbc.co.uk/newsround/67074940

Wiki has more detailed information on how Miyake Events are "stored" in trees and ice cores.
https://en.m.wikipedia.org/wiki/Miyake_event

[–] [email protected] 3 points 6 months ago