when was the last g4 geomagnetic storm

when was the last g4 geomagnetic storm

1 hour ago 2
Nature

A recent G4 (Severe) geomagnetic storm was observed around 12 November 2025 UTC, with reports indicating G4 conditions reached on 12 November 2025 around 01:20 UTC and continuing into the night, driven by a major CME associated with an X5.1 solar flare earlier that day. For the latest, space weather monitoring sites currently list G4 conditions and ongoing impacts into that period.

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