Planet Briefing

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G3 Strong — Warning: Geomagnetic K-index of 7 or greater expected

Reported by NOAA Space Weather Prediction Center Alerts, NOAA Space Weather Prediction Center Alerts, NOAA Space Weather Prediction Center Alerts

NOAA SWPC reported a G3 Strong geomagnetic alert after the K-index reached 7. The source lists the warning as active.

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Why it matters

The alert records a geomagnetic K-index threshold of 7 and an active warning.

Update history

  1. NOAA SWPC reported a G3 Strong geomagnetic alert after the K-index reached 7. The source lists the warning as active.

  2. NOAA SWPC reported an active G3 (Strong) alert after the geomagnetic K-index reached 7 at 17:58 UTC on October 10, 2026. The supplied notice does not specify impacts or protective actions.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence
8/10
Geographic reach
1/10
Global importance
2/10
Impact magnitude
3/10
Positivity
5/10
Urgency
5/10

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