GEOMAGNETIC STORMG2

G2 geomagnetic storm, October 31, 2026

Began
Map: G2 geomagnetic storm, October 31, 2026

A G2 (moderate) geomagnetic storm began on Saturday, October 31, 2026 around 18:00 UTC. The planetary K index reached 6, strong enough for auroras over the northern United States, from Washington state to New York, and northern Europe on clear, dark nights. It was set off by a disturbance in the solar wind arriving from the Sun.

Storm levelG2 · moderate
Peak Kp6
BeganOct 31 18:00 UTC
Storm nameModerate
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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.

Data: NASA DONKI and NOAA.

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