violet layer
violet layer
[′vī·ə·lət ‚lā·ər] (astronomy)
A layer of particles in the upper Martian atmosphere that scatter and absorb electromagnetic radiation at shorter wavelengths, making the atmosphere opaque to blue, violet, and ultraviolet light.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.