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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
17 APR-18 APR ACTIVE STORM G2
18 APR-19 APR ACTIVE STORM G2
19 APR-20 APR ACTIVE 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)
16 APR-17 APR QUIET QUIET 18:00-21:00 QUIET QUIET 06:00-09:00

Additional Comments

Solar wind speeds are currently low, and conditions to date have been QUIET. During this first period we anticipate the arrival of a high-speed stream (HSS) from a recurrent transequatorial coronal hole (CH42). During the previous solar rotation, this coronal hole produced solar wind speeds of up to ~700 km/s, although those observations were influenced by a CME. We expect the upcoming solar wind enhancement to increase the likelihood of geomagnetic activity up to STORM G2 levels during forecast periods one and two. Solar wind speeds are then expected to gradually decrease, with the likelihood of activity diminishing by the beginning of next week.
Time of forecast: 17 Apr 2026
© UKRI