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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
20 JAN-21 JAN STORM G3 STORM G4
21 JAN-22 JAN STORM G1 STORM G2
22 JAN-23 JAN ACTIVE STORM G1

For more information about the forecast and activity categories see
geomag.bgs.ac.uk/education/activitylevels.html

Activity during last 24 hours

Global   Local (UK)
Date Average Max At time (UTC) Average Max At time (UTC)
19 JAN-20 JAN STORM G3 STORM G4 21:00-00:00 STORM G2 STORM G4 21:00-00:00

Additional Comments

The Coronal Mass Ejection (CME), which lifted off from the Sun on 18-JAN, arrived at 19:17 UT on 19-JAN and caused STORM G4 geomagnetic conditions as measured by the BGS magnetometers. Activity continued at STORM G3 levels overnight. Earth is within the magnetic cloud of the CME, and geomagnetic storm conditions are ongoing. Similar levels of activity is likely to continue for the next 24-48 hours as the Interplanetary Magnetic Field remains negative and the solar wind speed is very high at around 950 km/s before declining during the third interval.
Time of forecast: 20 Jan 2026
© UKRI