From NASA's excellent Space Weather website:
THE SOLAR WIND HAS ARRIVED: As predicted, today Earth is entering a stream of solar wind flowing from a large hole in the sun's atmosphere. NOAA forecasters say there is a 55% chance of G1-class geomagnetic storms on Aug. 5th and 6th. High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where winter darkness favors visibility.
The Planetary K-Index is certainly showing this - a solid five.
If this event lasts through tonight, we have a great chance of seeing some aurora if the skies cooperate. If it hits six, then definitely.
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