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About: Stellar corona     Goto   Sponge   NotDistinct   Permalink

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A corona (pl. coronas or coronae) is the outermost layer of a star's atmosphere. It consists of plasma. The Sun's corona lies above the chromosphere and extends millions of kilometres into outer space. It is most easily seen during a total solar eclipse, but it is also observable with a coronagraph. Spectroscopic measurements indicate strong ionization in the corona and a plasma temperature in excess of 1000000 kelvins, much hotter than the surface of the Sun, known as the photosphere. The word corona is Latin for 'crown', in turn derived from Ancient Greek κορώνη (korṓnē) 'garland, wreath'.