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by keepamovin 764 days ago
K-Index is more like (as someone else smartly said) a kind of heuristic subjective measure like a "Cat 5 Hurricane"

Some more illuminating measurements are:

Carrington: Dst -1000 from an X80 flare and CME

May 2024 Event: Dst -250 from multiple up to X3.98 flares (and CMEs)