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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
5 SEP-6 SEP QUIET STORM G1
6 SEP-7 SEP ACTIVE STORM G2
7 SEP-8 SEP 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)
4 SEP-5 SEP QUIET ACTIVE 21:00-00:00 QUIET ACTIVE 21:00-00:00

Additional Comments

High-speed wind stream from the large southern hemisphere coronal hole will be arriving in the middle of the first forecast interval, which can enhance geomagnetic activity up to minor storm conditions.
A coronal mass ejection erupted from an active region in the central disc around 19:45 on 04 September (UTC). A glancing impact is anticipated in the middle of the second forecast interval - likely during early hours of 07 September (UTC), thereby increasing the geomagnetic activity to STORM G2. Geomagnetic conditions are expected to subside during the third forecast interval, with an outside chance of a minor storm occurring.
Time of forecast: 05 Sep 2025
© UKRI