chromosphere
/ˈkroʊməˌsfɪr/
noun
- A layer of gases above the surface of the sun, visible as a reddish glow during a total solar eclipse.
- The chromosphere is much hotter than the sun's surface below it.
- During the eclipse, the chromosphere appeared as a thin red ring around the moon.
- Astronomers use special filters to study the chromosphere of the sun.