Geo-Magnetic Storm Warning

Early Autumn Geomagnetic Storm reported by the NOAA......

A Geomagnetic Storm, now at the G2 (Moderate) level and now forecast to reach the G3 (Strong) level began following a shock arrival today (Sept 26) at 1237Z (8:37am, Eastern). This storm is a result of a Coronal Mass Ejection (CME) that erupted from the Sun on Saturday morning.

Customers who may be affected, power grid operators, satellite operators, commercial airlines, etc., have been notified and are taking appropriate actions to minimize any adverse impacts.

This is still early in the storm, waiting for the predicted higher levels of activity to occur and no impacts have yet been reported to SWPC – these will be contained in a For The Record that will follow this event at its completion.

This can consider this a near miss because we’re only seeing the flanks of the CME. If this one had been headed directly at the Earth, then severe (G4) to extreme (G5) storming would have been likely.

Also, the storm duration will be limited to about 12 hours, rather than the 24-36 hours that a direct hit could cause.

The active region responsible for the CME is moving into a more geo-effective position and will remain capable of sending more activity our way for several days. In the past 24 hours, a slight decrease in the frequency of activity has been noted, but the region remains capable of emitting strong storms.

The most likely locations for aurora from this storm are Europe and Asia , but activity could persist long enough for North American viewers. The maps below show likely visibility of aurora keyed to Green (G1), Yellow (G3), and Red (G5).