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MAGNETIC FROTH: Big sunspot AR1711 is not actively flaring. Instead, it is frothing. Sergio Castillo captured the phenomenon on April 2nd when he photographed the sun from Inglewood, California:
Castillo used a “Calcium K” (CaK) filter that passes light from singly-ionized calcium atoms in the sun’s atmosphere. CaK filters are excellent detectors of magnetic froth–the bubbly, turbulent sea of magnetism that surrounds many large sunspot groups.
“It is amazing to see how much a calcium filter can show you,” says Castillo. “Even ‘quiet’ sunspots look great.”
2013-04-03 10:34:50
Source: http://yeoldefalseflag.com/thread-magnetic-froth-sunspot-ar1711