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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
3 DEC-4 DEC QUIET STORM G1
4 DEC-5 DEC ACTIVE STORM G1
5 DEC-6 DEC 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)
2 DEC-3 DEC QUIET QUIET 18:00-21:00 QUIET QUIET 18:00-21:00

Additional Comments

The influence of a high speed stream (HSS) from a large recurrent coronal hole (CH) will be arriving during the first interval, and there are some early signs in the solar wind parameters that it might already be here and should keep geomagnetic conditions elevated over the coming days.
The edge of a coronal mass ejection (CME) observed on the 1-DEC could graze past our planet during the 2nd interval. This event coupled with the CH fast wind stream could raise activity levels ranging from ACTIVE to STORM G1 levels.
Time of forecast: 03 Dec 2025
© UKRI