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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
25 SEP-26 SEP QUIET ACTIVE
26 SEP-27 SEP QUIET STORM G1
27 SEP-28 SEP 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)
24 SEP-25 SEP QUIET ACTIVE 00:00-03:00 QUIET ACTIVE 00:00-03:00

Additional Comments

Solar wind speed is slightly elevated due to the onset of a high-speed stream from a southern coronal hole (CH). Up to ACTIVE spells are expected to continue in the first forecast window.
A second high-speed stream is anticipated to arrive on day two from a northern CH. A similar level of geomagnetic activity is likely to persist, but a small chance of isolated STORM G1 intervals cannot be ruled out as the CH effects combine.
By the end of the forecast, conditions should be declining to background levels and overall QUIET.
Time of forecast: 25 Sep 2026
© UKRI