The lower region of the solar chromosphere, formerly regarded as a distinct layer where the dark Fraunhofer lines of the solar spectrum are produced, superimposed on the continuous spectrum of the underlying photosphere.
Origin
Late 19th century; earliest use found in The Leeds Mercury.
Definition of reversing layer in US English:
reversing layer
noun
Astronomy historical
The lower region of the solar chromosphere, formerly regarded as a distinct layer where the dark Fraunhofer lines of the solar spectrum are produced, superimposed on the continuous spectrum of the underlying photosphere.
Origin
Late 19th century; earliest use found in The Leeds Mercury.