Sunspot:
An area of the Sun's photosphere, typically 2,500 to 50,000 km across, that appears dark because it is cooler than its surroundings. Sunspots are concentrations of magnetic flux and usually occur in pairs of opposite polarity that move in unison across the face of the Sun as it rotates; these pairs are linked by loops of magnetic field that arch through the Sun's corona.
LUNT LS60THa/B600/LS50FHa DS
DMK31AU03.AS at f/25
2010-09-19
Island of Syros
Greece
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