Warning!

Javascript is disabled on this browser.
Javascript must be enabled for this website to display and function correctly.

BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT) 		Forecast Global Activity level
Average Max
17 AUG-18 AUG ACTIVE STORM G2
18 AUG-19 AUG QUIET STORM G1
19 AUG-20 AUG 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)
14 AUG-15 AUG QUIET QUIET 18:00-21:00 QUIET QUIET 18:00-21:00
15 AUG-16 AUG QUIET ACTIVE 18:00-21:00 QUIET QUIET 18:00-21:00
16 AUG-17 AUG QUIET QUIET 03:00-09:00 QUIET QUIET 03:00-06:00

Additional Comments

A coronal mass ejection (CME) seen on 14-Aug associated with a filament lift off is expected to arrive in the first forecast period. Geomagnetic conditions are anticipated to be ACTIVE with chances of STORM G2 intervals. The effects from this CME are expected to gradually wane into the second period.
There are currently two coronal holes (CH) in an Earth-facing position visible on the solar disk. The onset of high-speed streams (HSS) from these are likely to arrive in the third period. ACTIVE up to STORM G1 conditions are likely to persist.
Another CME was observed 16-Aug from a C8.2 solar flare. Further analysis of this event is ongoing. Initial imagery indicates that due to the location of the source region the CME has an earth-directed component which could arrive late in the third forecast window.
Time of forecast: 17 Aug 2026
© UKRI