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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
19 DEC-20 DEC QUIET QUIET
20 DEC-21 DEC QUIET QUIET
21 DEC-22 DEC QUIET 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)
18 DEC-19 DEC QUIET ACTIVE 15:00-18:00 QUIET ACTIVE 15:00-18:00

Additional Comments

Solar wind speeds are reclining as we move out of the influence of a coronal hole high speed stream. Geomagnetic conditions are expected to remains at QUIET levels throughout the first two forecast intervals.
Another high speed stream is expected to become geoeffective late in the third forecast interval. This could cause some periods of ACTIVE geomagnetic conditions, with a chance for some STORM G1 periods.
Time of forecast: 19 Dec 2025
© UKRI