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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
4 JUN-5 JUN STORM G1 STORM G3
5 JUN-6 JUN ACTIVE STORM G2
6 JUN-7 JUN 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)
3 JUN-4 JUN QUIET ACTIVE 21:00-00:00 QUIET ACTIVE 03:00-06:00

Additional Comments

Currently the Earth is encountering weak coronal hole effects with slightly elevated solar wind speeds.
Three significant solar flares produced associated CMEs yesterday from the same centre disc active region with all of them having Earth directed components. The first is expected to arrive later today possibly early evening. The second may combine and merge with the preceding CME leading to a larger impact to the geomagnetic environment. This will likely cause STORM conditions with STORM G3 spells possible. The third CME is looking to prdominatly miss the Earth but a glance is still likely which will keep geomagnetic activity elevated through to the second forecast period with residual effects waning during the third.
Time of forecast: 04 Jun 2026
© UKRI