It occurs when the moon is seen through a thin altostratus or altocumulus that comprised of tiny water droplets. Corona results from the diffraction of light around the droplets. If cloud droplets are of uniform size, a corona is colored with blue-violet on the inside and red on the outside. These color rings may repeat themselves as fainting further from the moon. Corona is only a few degrees in radius, hence, is far smaller than a halo.
Glory appears as color rings around the shadow of the aircraft.
The appearance of color in glories depends on which color reaches our eyes from each droplet and what angle each color is reflected from the droplets. It appears as bright white light around the shadow of your head on a dew-covered lawn. Mirage is a refraction phenomenon that makes an object appear to be displaced from its original position. It occurs when sunlight passes through and is being bent by air layers of different densities. Such changes in air density are usually associated by sharp changes in air temperature.