False-color image of a polar mesospheric cloud obtained by the wind imaging interferometer (WINDII) on NASA's Upper Atmospheric Research Satellite (UARS) in support of the ANLC campaign. The false color indicates the intensity of the sunlight scattered by gases and aerosols in the upper atmosphere, with red indicating the most intense scattering. Image courtesy of W. F. J. Evans, Trent University.
Reference: W. F. J. Evans, et al., Observation of polar mesospheric clouds in summer, 1993 by the WINDII instrument on UARS, Geophys. Res. Lett., 22, 2793-2796, 1995.