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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
18 MAR-19 MAR QUIET STORM G1
19 MAR-20 MAR STORM G1 STORM G3
20 MAR-21 MAR STORM G1 STORM G3

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)
17 MAR-18 MAR QUIET QUIET 03:00-06:00 QUIET QUIET 03:00-09:00

Additional Comments

Coronal mass ejection (CME) associated with an M-class solar flare observed on 16-Mar is expected to arrive in the afternoon on 19-Mar.
Glancing impacts from two additional CMEs that left the Sun on 17-Mar are also anticipated during the second/third forecast interval.
An M-class was observed this morning, close to the centre of the solar disc. Further imagery is required however, due to the location of its origin, there is a high chance of another Earth-directed CME arriving most likely during the third forecast period.
Therefore, prolonged periods of elevated geomagnetic conditions are anticipated, possibly reaching STORM G3 levels.
Time of forecast: 18 Mar 2026
© UKRI