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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
28 AUG-29 AUG ACTIVE STORM G2
29 AUG-30 AUG QUIET STORM G1
30 AUG-31 AUG QUIET QUIET

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)
27 AUG-28 AUG QUIET QUIET 21:00-03:00 QUIET QUIET 00:00-03:00
QUIET 09:00-12:00

Additional Comments

A glancing blow from two coronal mass ejections (CME) is expected to arrive during the first forecast interval. So far there has been little sign of the expected high-speed solar stream from a coronal hole, however there are early signs this morning of an increase in solar wind speed. The combined effects from any CME impact and coronal hole influence could result in geomagnetic activity reaching STORM G1 or STORM G2 levels. Activity is then expected to return to QUIET levels toward the end of the forecast.
Time of forecast: 28 Aug 2026
© UKRI