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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 QUIET ACTIVE
19 AUG-20 AUG QUIET STORM G1
20 AUG-21 AUG 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)
17 AUG-18 AUG ACTIVE ACTIVE 03:00-06:00 QUIET ACTIVE 18:00-21:00

Additional Comments

There was only mild enhancement in geomagnetic activity in the last 24 hours following the arrival of the coronal mass ejection (CME) from 14-Aug. The solar wind speed is currently slightly elevated at ~400 km/s. The effects of this CME will gradually decline throughout the first forecast window, and further ACTIVE conditions are expected to persist.
The onset of faster solar wind from two recurrent coronal holes (CH) is anticipated in the second period onwards with chances of STORM G1.
A glancing blow from a CME observed on 16-Aug may arrive in the third forecast interval, although the timing and magnitude of this is uncertain due to limited imagery. ACTIVE to STORM G1 periods are possible.
Time of forecast: 18 Aug 2026
© UKRI