Alternate Definitions for chromosphere

The layer of the solar atmosphere above the photosphere and beneath the transition region and the corona. The chromosphere is the source of the strongest lines in the solar spectrum, including the Balmer alpha line of hydrogen and the H and K lines of calcium, and is the source of the red color often seen around the rim of the moon at total solar eclipses.

The region of the Sun’s atmosphere that exists just above the photosphere. The chromosphere is visible with a special narrow band telescope the views the emissions of Hydrogen-alpha.