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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
22 AUG-23 AUG QUIET STORM G1
23 AUG-24 AUG QUIET ACTIVE
24 AUG-25 AUG 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)
21 AUG-22 AUG QUIET QUIET 00:00-03:00 QUIET QUIET 00:00-03:00

Additional Comments

The solar wind speed increased after 21:00 UT on 21 August due to the lingering influence of a coronal high-speed stream. Enhancement of geomagnetic activity to ACTIVE conditions is likely, with a very low probability of a minor geomagnetic storm occurring if the Coronal Mass Ejection from the filament eruption on 20 August has any glancing impact on Earth.
Another high-speed CME produced a near-halo structure on the far side of the Sun on 21 August, but this CME is not considered Earth-directed. To be on the side of caution, there is a very low probability of isolated ACTIVE periods occurring in the second and third forecast intervals due to weak CME influence.
Time of forecast: 22 Aug 2025
© UKRI