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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
12 SEP-13 SEP QUIET QUIET
13 SEP-14 SEP ACTIVE STORM G1
14 SEP-15 SEP ACTIVE 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)
11 SEP-12 SEP QUIET QUIET 03:00-06:00 QUIET QUIET 03:00-06:00

Additional Comments

The solar wind speed has returned to background levels, and we expect QUIET conditions during the first forecast period.
A High-Speed Stream (HSS) from a large, recurrent trans-equatorial coronal hole is expected to arrive during the second forecast period. Due to its size, and based on previous rotations, we anticipate enhanced geomagnetic activity, potentially reaching minor storm levels (STORM G1) during the second and third forecast periods.
Time of forecast: 12 Sep 2025
© UKRI