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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
17 OCT-18 OCT QUIET STORM G1
18 OCT-19 OCT ACTIVE STORM G2
19 OCT-20 OCT 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)
16 OCT-17 OCT QUIET QUIET 18:00-21:00 QUIET QUIET 18:00-21:00

Additional Comments

Several coronal mass ejections (CMEs) observed leaving the Sun in the last few days are expected to reach the Earth this weekend. Some of them may have merged along the way, resulting in a much stronger combined arrival.
The influence of a coronal hole high speed stream expected during the third forecast interval may further increase the geomagnetic activity.
Overall ACTIVE geomagnetic conditions are anticipated, with chances of STORM G1 and STORM G2 intervals during the upcoming weekend.
Time of forecast: 17 Oct 2025
© UKRI