GEOMAGNETIC STORMG3

G3 geomagnetic storm, October 10, 2026

Began
Map: G3 geomagnetic storm, October 10, 2026

A G3 (strong) geomagnetic storm began on Saturday, October 10, 2026 around 15:00 UTC. The planetary K index reached 7, strong enough for auroras as far south as Oregon, Iowa and Pennsylvania, and across much of Europe on clear, dark nights. It was set off by a disturbance in the solar wind arriving from the Sun.

Storm levelG3 · strong
Peak Kp7
BeganOct 10 15:00 UTC
Storm nameStrong
See it on the live 3D globe →Watch live on YouTube🔔 Get alerts near you

The K index during the storm

G1G3G503581018:0019:3021:00Planetary K index (3-hour)

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?

Coronagraphs. The SOHO spacecraft hides the Sun’s bright disk behind a small disc, an artificial eclipse, so it can watch eruptions stream away into space.

Data: NASA DONKI and NOAA.

More: every space weather and near-Earth page · all events

More from around the world