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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
21 JAN-22 JAN STORM G1 STORM G2
22 JAN-23 JAN ACTIVE STORM G1
23 JAN-24 JAN QUIET ACTIVE

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)
20 JAN-21 JAN STORM G3 STORM G3 21:00-00:00 STORM G3 STORM G4 18:00-03:00

Additional Comments

CME effects continued over the past 24 hours, and the interplanetary magnetic field (IMF) has been negative for a prolonged period of around 36 hours resulting in sustained levels of geomagnetic activity, reaching STORM G3 levels overall with a brief period G4 overnight.
Residual effects from this CME are likely to continue during the first and into the second interval, whilst gradually on a declining trend. Hence periods of STORM G1 to G2 are still likely, and we can't rule out a chance of a brief period of STORM G3 during the first interval.
Two further M-class flares have been detected and currently under analysis to determine if there are any associated CMEs are present. However, one of these flares are from a region close to the eastern limb, and it is unlikely to be geo-effective.
Time of forecast: 21 Jan 2026
© UKRI