Definitions for "Chromosphere"
An atmosphere of rare matter, composed principally of incandescent hydrogen gas, surrounding the sun and enveloping the photosphere. Portions of the chromosphere are here and there thrown up into enormous tongues of flame.
The region of the sun just above the photosphere of the sun. The gases there are hotter than the photosphere. Solar flares and solar prominences come out of the chromosphere.
That part of the solar atmosphere that lies immediately above the photospheric layers.