Night clouds or noctilucent clouds are tenuous cloud-like phenomena that are the "ragged edge" of a much brighter and pervasive polar cloud layer called polar mesospheric clouds in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. Noctilucent roughly means night shining in Latin.
My first Image of Noctilucent clouds taken 2014 in Dungannon
Me capturing My first Noctilucent cloud Display
A NLC Display Dungannon
NLC Display Dunluce castle, county Antrim June 2015