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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
30 MAR-31 MAR QUIET ACTIVE
31 MAR-1 APR STORM G1 STORM G3
1 APR-2 APR ACTIVE STORM G1

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)
27 MAR-28 MAR QUIET ACTIVE 00:00-03:00 QUIET ACTIVE 00:00-03:00
28 MAR-29 MAR QUIET ACTIVE 03:00-06:00 QUIET ACTIVE 03:00-09:00
29 MAR-30 MAR QUIET ACTIVE 15:00-18:00 QUIET ACTIVE 15:00-18:00

Additional Comments

A high-speed stream from a coronal hole arrived on the 29th. This is currently elevating solar wind speeds resulting in some ACTIVE conditions. This may continue during the first forecast period.
A long-duration X1 flare was observed earlier this morning peaking at 03:19UT. A full-halo coronal mass ejection (CME) was associated with this event. Initial modelling predicts a glancing blow arriving around the middle of the 31st. After the CME arrival geomagnetic activity could increase to STORM G1/G2 levels, with a chance of reaching STORM G3 if the CME impact is significant.
Geomagnetic activity may begin to wane after the CME passes before the next high-speed stream from another coronal hole begins to arrive on or after the 2nd April.
Time of forecast: 30 Mar 2026
© UKRI