If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user
From SKYbrary Wiki
High level, uniform layer of thin white cloud.
Viewed from below the cloud, the sun and moon may be seen to have a bright halo with a red tinge to the edges.
Because of the high altitude, and therefore low temperature, cirrostratus clouds are composed of ice crystals rather than water particles.