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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
13 JUN-14 JUN ACTIVE STORM G2
14 JUN-15 JUN ACTIVE STORM G2
15 JUN-16 JUN ACTIVE STORM G2

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)
12 JUN-13 JUN STORM G1 STORM G3 00:00-03:00 STORM G1 STORM G3 00:00-03:00

Additional Comments

Overnight, the Earth's magnetic field strongly has connected to the southward component of the interplanetary magnetic field (IMF), that has been negative for around 14 hours, resulting in sustained levels of geomagnetic activity averaging STORM G1 and up-to STORM G3 levels. It is thought that a co-rotating interactive region (CIR) , ahead of a coronal hole high speed stream, combined with the 8-JUN CME is responsible for this prolonged and enhanced level of activity.
The high speed stream from the large re-current southern coronal hole is expected to start influencing geomagnetic conditions from the 2nd period onward. Further STORM periods are likely throughout the weekend.
The CMEs mentioned in yesterday forecasts have been reviewed and are now discounted.
Time of forecast: 13 Jun 2025
© UKRI