CORONAL HOLES: NASAs Solar Dynamics Observatory is monitoring a pair of coronal holes straddling the suns equator. They are the deep-blue wedges in this extreme ultraviolet image of the sun taken mid-day on April 9th: Coronal holes are places in the suns atmosphere where the ambient magnetic field opens up and allows solar wind to escape. A double-stream of solar wind flowing from these coronal holes could reach Earth on April 13-14. It is possible that neither stream will be geoeffective as they flow north and south of our planet. On the other hand, a brush pass might still spark polar auroras. Stay tuned for updates. spaceweather/images2014/09apr14/doublech.jpg?PHPSESSID=eibi3aef0prb8n2v5niptapq75
Posted on: Thu, 10 Apr 2014 06:25:39 +0000
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