One of the mysteries of the English language finally explained.
A reddish gaseous layer immediately above the photosphere of the sun or another star which, together with the corona, constitutes its outer atmosphere.
- ‘For decades astronomers labored to get good photographs of the chromosphere, and in particular its spectrum.’
- ‘Prominences, flares, plages, and other features of the solar chromosphere can be observed in hydrogen light.’
- ‘Solar flares appear as sudden, intense flashes in the chromosphere of the Sun.’
- ‘The chromosphere is the first layer of atmosphere above the sun's surface layer.’
- ‘But the hotter hydrogen in the chromosphere and corona above it is madly emitting at the same wavelength.’
Mid 19th century: from chromo- ‘colour’ + sphere.
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