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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
9 SEP-10 SEP QUIET STORM G1
10 SEP-11 SEP QUIET ACTIVE
11 SEP-12 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)
8 SEP-9 SEP QUIET ACTIVE 15:00-18:00 QUIET ACTIVE 15:00-18:00

Additional Comments

There has been limited enhancement in solar wind parameters associated with three coronal mass ejections (CMEs) observed on the 5th and 6th September. Wind speed is still slightly elevated so there remains a chance of STORM G1 reducing to ACTIVE intervals in the first and second forecast windows as CME effects wane.
The onset of a high-speed stream from a small, trans-equatorial coronal hole (CH) is anticipated on day three. Geomagnetic activity will be potentially elevated up to STORM G1 as the CH becomes geoeffective.
Time of forecast: 09 Sep 2026
© UKRI