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
11 SEP-12 SEP QUIET STORM G1
12 SEP-13 SEP QUIET QUIET
13 SEP-14 SEP 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)
10 SEP-11 SEP QUIET QUIET 21:00-00:00 QUIET QUIET 21:00-00:00

Additional Comments

A high-speed stream from a coronal hole (CH) is expected to arrive today. This is a non-recurrent CH so there is some uncertainty in the magnitude of any resulting geomagnetic activity but there may be intervals of up to STORM G1.
In the second forecast window, solar wind parameters should decline towards background levels bringing overall QUIET conditions.
There were two filament eruptions with associated coronal mass ejections (CMEs) observed yesterday 10-Sep, as well as a faint, slow CME on 9-Sep. These may have Earth-directed components, with potential glancing impact on 14-Sep so there is a chance of ACTIVE spells if these start to become geoeffective in the latter half of the third period.
Time of forecast: 11 Sep 2026
© UKRI