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BGS Global Geomagnetic Activity Forecast

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

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 APR-18 APR QUIET ACTIVE 03:00-06:00 QUIET STORM G1 03:00-06:00

Additional Comments

Solar wind speed remains slightly enhanced due to residual CME effects, combined with weak influence from a high speed stream associated with a small westerly coronal hole which may continue into day two. Overall, geomagnetic activity should be QUIET although there will remain a chance of some occasional ACTIVE periods over the next couple of days and we cannot rule out a very slight chance that it could peak briefly at STORM G1 on day one.
A high speed stream from a large southerly coronal hole is anticipated to become geoeffective early next week, although there is some uncertainty about initial arrival time. Most likely it will be beyond day three, but it is possible that we could start to see something by the end of the forecast period in which case ACTIVE periods may be possible, perhaps STORM G1.
Time of forecast: 18 Apr 2025
© UKRI