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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
22 MAR-23 MAR STORM G1 STORM G3
23 MAR-24 MAR ACTIVE STORM G1
24 MAR-25 MAR QUIET ACTIVE

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)
21 MAR-22 MAR ACTIVE STORM G2 00:00-03:00 STORM G1 STORM G2 00:00-03:00

Additional Comments

Overnight geomagnetic activity reached STORM G2 levels due to a coronal mass ejection (CME) impact.
Yesterday afternoon a faint but fast Earth-directed CME was observed. The source was a filament eruption from a central location on the solar disk, associated with a M1 solar flare from a nearby active region. Models suggest this may arrive in the first forecast interval (late 22, or early 23). The combination of CME impacts and a high-speed solar wind stream from a coronal hole may result in STORM activity. As we are near the equinox, when the Earth is more susceptible to solar activity, it is possible geomagnetic activity could reach STORM G3.
These effects may continue into the second forecast period before waning. Late in the forecast we may start to see another enhancement in the solar wind from another high-speed stream from a large coronal hole.
Time of forecast: 22 Mar 2025
© UKRI