Geomagnetic storm update - 14^th November 2025

The CME associated with the X5.1 flare from the 11th November arrived on the evening of the 12th. In the UK, geomagnetic activity reached STORM G4 levels between 00:00 and 09:00 UT on 13th November, but the global index only reached STORM G3. Although the interplanetary magnetic field component Bz did turn southward for a while, it did not get that strong (less than 20 nT) and it did not persist for long periods, so we didn’t see the high levels of geomagnetic activity that were originally anticipated.

Details from the preceding geomagnetic storm on the 11th/ 12th November can be found here.

Another X4 class flare occurred around 08:10 UT on the 14th from the same active region (14274). However, this region has rotated away from a direct Earth facing position and the resulting CME will likely only have glancing effects, and geomagnetic activity is unlikely to be significantly impacted as a result.

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Glossary

BGS

The British Geological Survey is a geoscience research centre that is part of UK Research and Innovation (UKRI) and affiliated to the Natural Environment Research Council (NERC).

CME or Coronal Mass Ejection

The eruption of a portion of the outer atmosphere of the Sun into space, caused by rapid changes in its magnetic field. Often occurs along with a solar flare.

Solar Flare

Energy released by the explosive reorganisation of magnetic fields within the Sun's atmosphere.

Solar Wind

The ever-present expansion of the Sun’s hot outer atmosphere into the solar system, which carries space weather within it.

Solar Flare

Energy released by the explosive reorganisation of magnetic fields within the Sun's atmosphere.

Sunspot/Active Region

A region of intense magnetic field in the Sun's visible outer atmosphere often associated with flares and CMEs.

© UKRI