Sunspot AR9393 is now the largest in ten years and is growing fast. The sunspot is presently thirteen times the size of earth. An eruption near the sunspot sent a coronal mass ejection toward earth earlier today. Forecasters estimate a 15 to 25% chance of a severe geomagnetic storm when the material reaches earth, probably on Friday.

The number of sunspots has reached 352, up from 224 earlier today.

The last time a magnetic storm caused severe damage was the memorable March 13, 1989 event, which shut down power grids and blew out huge transformers throughout the northern hemisphere.
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