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Magnetic Activity on the Sun
Thursday, May 9, 2013 4:24
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A ragged, dynamic filament of magnetism is dancing along the sun’s southwestern limb today. It is so large, more than 250,000 km from end to end, that amateur astronomers are able to see it in great detail using backyard solar telescopes. John Stetson sends this snapshot from Falmouth, Maine:
![[Image: prom_strip.jpg]](http://www.spaceweather.com/images2013/09may13/prom_strip.jpg)
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