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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
22 SEP-23 SEP QUIET QUIET
23 SEP-24 SEP QUIET STORM G1
24 SEP-25 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)
21 SEP-22 SEP QUIET QUIET 00:00-03:00 QUIET QUIET 00:00-03:00

Additional Comments

Conditions are expected to remain QUIET at the beginning of the forecast before the anticipated arrival of a high-speed stream from a recurrent coronal hole (CH) in the second period. Geomagnetic activity may be enhanced up to STORM G1 as this becomes geoeffective.
ACTIVE spells are likely in the third forecast window as the CH influence declines.
A second CH is crossing the central meridian today but any associated activity is expected beyond this forecast.
Time of forecast: 22 Sep 2026
© UKRI