[kroh-muh-sfeer] /ˈkroʊ məˌsfɪər/

noun, Astronomy.
a scarlet, gaseous envelope surrounding the sun outside the photosphere, from which enormous quantities of hydrogen and other gases are erupted.
a gaseous envelope surrounding a star.
a gaseous layer of the sun’s atmosphere extending from the photosphere to the corona and visible during a total eclipse of the sun

1868, coined by English astronomer Sir Joseph Norman Lockyer (1836-1920), from chromo-, from Greek khroma “color” (see chroma) + sphere. So called for its redness.
A glowing, transparent layer of gas surrounding the photosphere of a star. The Sun’s chromosphere is several thousand kilometers thick, is composed mainly of hydrogen at temperatures of 6,000° to 20,000°K, and gives off reddish light.


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