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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
15 SEP-16 SEP ACTIVE STORM G1
16 SEP-17 SEP ACTIVE ACTIVE
17 SEP-18 SEP QUIET ACTIVE

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)
12 SEP-13 SEP QUIET QUIET 03:00-09:00 QUIET QUIET 03:00-09:00
13 SEP-14 SEP QUIET QUIET 00:00-06:00 QUIET QUIET 00:00-06:00
14 SEP-15 SEP STORM G1 STORM G2 00:00-03:00 ACTIVE STORM G2 00:00-03:00

Additional Comments

Solar wind speed is currently elevated due to a Coronal Hole High Speed Stream which produced some minor storm periods overnight, peaking at G2. The effects of this HSS are expected to continue over the next few days, although they should start to decline around day two. ACTIVE periods are expected for the next couple of days, with a chance of further spells of STORM G1, most likely during day one.
Time of forecast: 15 Sep 2025
© UKRI