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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
17 DEC-18 DEC QUIET STORM G1
18 DEC-19 DEC QUIET QUIET
19 DEC-20 DEC QUIET QUIET

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)
16 DEC-17 DEC QUIET QUIET 15:00-18:00 QUIET ACTIVE 15:00-18:00

Additional Comments

We are still under the influence of a coronal hole high speed stream, which has elevated solar wind speeds and a caused a slight strengthening of the IMF (interplanetary magnetic field). Solar wind speeds are expected to decrease throughout the first forecast interval and no further enhancements are anticipated during the remaining intervals. Some periods of ACTIVE conditions may be possible during the first forecast interval, with a very slight chance for isolated STORM G1 periods, before a return to QUIET conditions.
Time of forecast: 17 Dec 2025
© UKRI