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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
10 SEP-11 SEP QUIET ACTIVE
11 SEP-12 SEP QUIET STORM G1
12 SEP-13 SEP QUIET ACTIVE

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)
9 SEP-10 SEP QUIET ACTIVE 00:00-03:00 QUIET ACTIVE 12:00-15:00
ACTIVE 18:00-21:00

Additional Comments

Solar wind speed remains elevated at ~450km/s due to residual CME influence and some further ACTIVE spells are possible on day one whilst these conditions are sustained.
In the second forecast period, a high-speed stream from a small, non-recurrent coronal hole (CH) is expected to arrive. Geomagnetic activity may reach up to STORM G1.
Activity should begin declining towards the end of the forecast, reducing to mostly QUIET although some brief ACTIVE intervals are possible.
A faint coronal mass ejection (CME) was observed leaving the sun yesterday 9th September. There is not a clear source for this CME and analysis is ongoing to determine if there is any Earth-directed component.
Time of forecast: 10 Sep 2026
© UKRI