Sic Itur Ad Astra – Thus The Way To The Stars : 142 years of astronomy
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Possibility of aurora tonight, Sunday 17th March 2013
Following a large Coronal Mass Ejection (CME) impact earlier today, there is a possibility of aurora tonight.
At the time of writing the KP index is measuring 6. The higher the number, the more likely we are to see an aurora. KP=6 means there’s a possibility. If it gets to 7 above the likelyhood increases a lot.