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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
18 AUG-19 AUG ACTIVE STORM G1
19 AUG-20 AUG ACTIVE STORM G1
20 AUG-21 AUG 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)
15 AUG-16 AUG QUIET QUIET 18:00-21:00 QUIET QUIET 18:00-21:00
QUIET 03:00-06:00
16 AUG-17 AUG QUIET QUIET 15:00-18:00 QUIET QUIET 21:00-00:00
QUIET 21:00-00:00
17 AUG-18 AUG QUIET QUIET 12:00-15:00 QUIET QUIET 03:00-06:00
QUIET 03:00-06:00

Additional Comments

A recurrent coronal hole that has caused STORM G1 activity in the previous solar rotation is anticipated to unleash high-speed wind streams and enhance geomagnetic conditions once again. This is expected to occur in the first two forecast intervals.
A coronal mass ejection observed on 17-AUG may have a glancing effect on the Earth. If this were to happen, geomagnetic conditions will become more disturbed and reach minor storm conditions within those forecast intervals. This will introduce several periods of ACTIVE conditions.
Time of forecast: 18 Aug 2025
© UKRI