First published 10/4/2026, 8:59:15 PM · Last updated 10/4/2026, 9:17:15 PM

Extended Warning: Geomagnetic K-index of 5 expected

A warning forecast a geomagnetic K-index of 5, classified as G1 minor, from September 7 to September 8, 2026. The source lists possible minor satellite-operation impacts, weak power-grid fluctuations, and aurora visibility at high latitudes.

Categories: science-and-space, energy-and-resources

Generated scores

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

Confidence: 8/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 3/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 2/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Positivity: 4/10How harmful or beneficial the event is, from strongly harmful (1) to strongly positive (10).
Urgency: 3/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Why it matters

The alert identifies possible minor effects on satellite operations and power grids, as well as potential aurora visibility.

Sources

Extended Warning: Geomagnetic K-index of 5 expectedNOAA/NWS Space Weather Prediction Center Usage terms
Extended Warning: Geomagnetic K-index of 5 expectedNOAA/NWS Space Weather Prediction Center Usage terms
Alert: Geomagnetic K-index of 5NOAA/NWS Space Weather Prediction Center Usage terms
Warning: Geomagnetic K-index of 5 expectedNOAA/NWS Space Weather Prediction Center Usage terms

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