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Description
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.
Corona (Latin for 'crown') is, in turn, derived from Ancient Greek __ κορώνη ( _korṓnē )_ 'garland, wreath'.
*[PL]: plural form
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