|Contrail Shadow & Halo
Pictured by Pierre Jobin across the bay of Saint-Brieuc in western France.
Images ©Pierre Jobin, shown with permission
|Contrails, their shadows and a 22° halo combine into eerie scenes. The cloud diffused sun surely shines upwards to cast a shadow onto higher cloud. The truth is the reverse. The contrail is above a thin layer of cirrus. The sun casts the shadow downwards onto lower cloud. We see it all through the translucent cloud screen. The reversed view creates the illusion..
Smaller crystals or supercooled water droplets have diffracted sunlight to produce the iridescent colours near the sun.
The shadow is seen through the lower cloud layer.