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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
20 JUL-21 JUL QUIET ACTIVE
21 JUL-22 JUL QUIET STORM G1
22 JUL-23 JUL QUIET STORM G1

For more information about the forecast and activity categories see
geomag.bgs.ac.uk/education/activitylevels.html

Activity during last 72 hours

Global   Local (UK)
Date Average Max At time (UTC) Average Max At time (UTC)
17 JUL-18 JUL QUIET QUIET 12:00-15:00 QUIET QUIET 00:00-03:00
QUIET 00:00-03:00
18 JUL-19 JUL QUIET QUIET 15:00-21:00 QUIET QUIET 18:00-21:00
19 JUL-20 JUL QUIET QUIET 09:00-12:00 QUIET QUIET 03:00-06:00

Additional Comments

Solar wind speeds are expected to start increasing late in the first forecast interval, continuing to increase into the second forecast interval, due to the influence of a high speed stream from a large, recurrent coronal hole. This is likely to lead to some periods of ACTIVE geomagnetic conditions, with an increasing chance of STORM G1 periods in the second forecast interval. Solar wind speeds are then expected to start to wane towards the end of the third forecast interval.
Two coronal mass ejections (CMEs) left the Sun overnight, heading mostly to the south-west. Initial analysis suggests they are not likely to become geoeffective, but further analysis is required to confirm this.
Time of forecast: 20 Jul 2026
© UKRI