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BGS Global Geomagnetic Activity Forecast

Forecast period
(noon-to-noon GMT)
Forecast Global Activity level
Average Max
21 APR-22 APR QUIET QUIET
22 APR-23 APR QUIET STORM G1
23 APR-24 APR ACTIVE STORM G2

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

Activity during last 24 hours

Global   Local (UK)
Date Average Max At time (UT) Average Max At time (UT)
20 APR-21 APR QUIET ACTIVE 12:00-15:00 QUIET ACTIVE 12:00-15:00

Additional Comments

Solar wind speed is declining as Coronal Hole effects continue to wane. Geomagnetic activity is expected to be QUIET for the next day or two before a further recurrent transequatorial Coronal Hole becomes geoeffective. The associated high speed stream from this Coronal Hole produced periods of STORM G2 on the previous rotation and it is possible we could see these levels of activity again this time around. Although the chance is very small we cannot rule out a possibility that we may see an isolated period of STORM G3.
Any influence from the Coronal Mass Ejection (CME) on the 18th is likely to be minimal. Two filament eruptions were observed yesterday but given their location the associated CMEs are unlikely to have any significant Earth-directed component.
Time of forecast: 21 Apr 2017
© NERC 2015