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BGS Global Geomagnetic Activity Forecast

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

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)
19 APR-20 APR ACTIVE STORM G2 06:00-09:00 QUIET STORM G2 06:00-09:00

Additional Comments

A shock in the solar wind arrived shortly before midnight, this is likely related to the coronal hole high speed stream, but may be indicative of the arrival of a coronal mass ejection (CME). The solar wind speed has continued to increase since the shock and the strength of the interplanetary magnetic field (IMF) has reached > 20nT. This has led to a period of STORM G2 this morning.
Further STORM G2 periods remain likely throughout the first interval, with a possibility of STORM G1 periods into the second interval, particularly if the IMF Bz remains negative for an extended period of time.
Time of forecast: 20 Apr 2018
© NERC 2017