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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
26 JUN-27 JUN ACTIVE STORM G1
27 JUN-28 JUN QUIET ACTIVE
28 JUN-29 JUN 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)
25 JUN-26 JUN QUIET ACTIVE 18:00-21:00 QUIET ACTIVE 18:00-21:00

Additional Comments

Solar wind speed remains elevated at around 650 km/s due to continuing coronal hole (CH) effects. We are due to transition into another high-speed stream (HSS) from a trans-equatorial CH during the first forecast interval, enhancing geomagnetic activity further potentially up to STORM G1 level.
Further ACTIVE periods are possible due to persisting CH influence throughout the weekend but with a declining trend.
There are currently no known Earth-directed CMEs. Solar activity likely to increase as a large and complex active region has now fully rotated into view on the solar disk.
Time of forecast: 26 Jun 2026
© UKRI