GEOMAGNETIC STORMG1

G1 geomagnetic storm, October 4, 2026

Began
Map: G1 geomagnetic storm, October 4, 2026

A G1 (minor) geomagnetic storm began on Sunday, October 4, 2026 around 18:00 UTC. The planetary K index reached 5.67, strong enough for auroras across Canada, the northern edge of the United States, Scotland and Scandinavia on clear, dark nights. It was set off by a disturbance in the solar wind arriving from the Sun.

Storm levelG1 · minor
Peak Kp5.67
BeganOct 4 18:00 UTC
Storm nameMinor
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The G scale

NOAA rates geomagnetic storms G1 (minor) to G5 (extreme) by the K index: G1 at Kp 5, G2 at 6, G3 at 7, G4 at 8 and G5 at 9. The stronger the storm, the farther from the poles auroras reach, and the more it can disturb power grids, satellites and GPS. Tonight’s outlook: aurora forecast.

Did you know?

Seeing the Sun. NOAA’s GOES-19 satellite photographs the Sun in extreme ultraviolet light every few minutes. Bright patches are active regions, where flares erupt.

Data: NASA DONKI and NOAA.

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