NOAA had previously issued an alert for possible G3 conditions on Sept. 16, these were then superseded by even more severe G4 conditions around 10:57 p.m. EDT(0257 GMT on Sept. 17).
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Actually, NOAA did issue an alert.
ReplyDeletehttps://www.space.com/severe-geomagnetic-storm-auroras-northern-lights-harvest-moon
NOAA had previously issued an alert for possible G3 conditions on Sept. 16, these were then superseded by even more severe G4 conditions around 10:57 p.m. EDT(0257 GMT on Sept. 17).