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BGS Global Geomagnetic Activity Forecast

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

Additional Comments

Solar wind parameters have started to increase over the past hours likely due to the onset of fast solar wind from a southern coronal hole (CH). As conditions are still increasing there is a chance of some STORM G1 intervals on day one.
Geomagnetic activity is anticipated to decline in the second forecast window as CH effects wane, though there remains a possibility of ACTIVE spells.
In the third period, there may be a transition into a high-speed stream from a northern negative polarity CH. This is expected to be less geoeffective at this time of year due to the polarity but there may still be some enhancement in conditions.
Time of forecast: 24 Sep 2026
© UKRI