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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
19 AUG-20 AUG ACTIVE STORM G1
20 AUG-21 AUG ACTIVE STORM G1
21 AUG-22 AUG 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)
18 AUG-19 AUG ACTIVE STORM G1 18:00-21:00 ACTIVE STORM G1 18:00-21:00

Additional Comments

The early onset of a high-speed stream (HSS) from a recurrent southern coronal hole (CH) elevated solar wind velocity up to ~600 km/s over the past 24hrs. A second HSS from a recurrent northern CH is expected to arrive in the first forecast period which may further enhance solar wind parameters. ACTIVE to STORM G1 conditions are anticipated.
A similar level of geomagnetic activity is expected to continue into the second interval due the combined effects of the second CH and a possible glancing blow from a coronal mass ejection (CME) on 16-Aug.
Activity should start to decline into the third forecast window, reducing down to mostly QUIET with the potential for further brief ACTIVE intervals.
Time of forecast: 19 Aug 2026
© UKRI