reversing layer

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A supposed region in the atmosphere of a star, particularly the Sun, where the dark Fraunhofer lines of the star's spectrum were once presumed to originate. At the end of the 19th century the solar chromosphere was thought to be the reversing layer (its spectrum being the reverse of the Fraunhofer spectrum), but it is now known that the Fraunhofer lines are produced in the photosphere, along with the continuum radiation, so that a specific reversing layer does not exist.

Subjects: Astronomy and Astrophysics.

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