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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
7 SEP-8 SEP QUIET STORM G1
8 SEP-9 SEP ACTIVE STORM G2
9 SEP-10 SEP QUIET STORM G1

For more information about the forecast and activity categories see
geomag.bgs.ac.uk/education/activitylevels.html

Activity during last 72 hours

Global   Local (UK)
Date Average Max At time (UTC) Average Max At time (UTC)
4 SEP-5 SEP QUIET QUIET 03:00-06:00 QUIET QUIET 03:00-06:00
5 SEP-6 SEP QUIET QUIET 00:00-03:00 QUIET QUIET 06:00-09:00
QUIET 06:00-12:00
6 SEP-7 SEP QUIET QUIET 18:00-21:00 QUIET QUIET 18:00-21:00

Additional Comments

Solar wind parameters are starting to increase associated with a high-speed stream from a small coronal hole (CH).
Several coronal mass ejections (CMEs) were observed on the 5th and 6th September. Two CMEs observed on the 5th may have a glancing impact later in the first forecast interval. Combined with the CH influence, STORM G1 conditions are likely.
A CME from the 6th is expected to arrive in the second period. Should all three CMEs arrive, geomagnetic activity may reach STORM G2 levels, and a small chance of STORM G3 cannot be ruled out.
Activity is anticipated to decline into the third window, though there remains a possibility of STORM G1 intervals as CME effects wane.
Time of forecast: 07 Sep 2026
© UKRI