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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
19 MAY-20 MAY QUIET ACTIVE
20 MAY-21 MAY QUIET ACTIVE
21 MAY-22 MAY QUIET ACTIVE

For more information about the forecast and activity categories see
geomag.bgs.ac.uk/education/activitylevels.html

Activity during last 72 hours

Global   Local (UK)
Date Average Max At time (UTC) Average Max At time (UTC)
16 MAY-17 MAY ACTIVE STORM G2 00:00-03:00 ACTIVE STORM G2 00:00-03:00
17 MAY-18 MAY ACTIVE STORM G1 06:00-09:00 ACTIVE STORM G1 06:00-09:00
18 MAY-19 MAY QUIET ACTIVE 15:00-18:00 QUIET ACTIVE 18:00-21:00

Additional Comments

Geomagnetic activity was enhanced over the weekend due to a combination of effects from a coronal mass ejection (CME) and coronal hole. Firstly, a glancing blow from a CME (a filament lift off which was observed on the 12th May) arrived early on the 17th. Shortly after a high-speed stream from a large coronal hole in the southern hemisphere arrived, further enhancing geomagnetic conditions.
The effects from the large coronal hole are continuing but starting to wane. There is a chance of further ACTIVE periods while the high-speed stream remains influential. No other Earth-bound solar activity was observed.
Time of forecast: 19 May 2025
© UKRI