Noctilucent cloud season begins
The 2013 noctilucent cloud (NLC) season has definitely kicked off; I staggered out of the pub last night to find the twilight arch full of this splendid display. For readers who have not heard of these clouds before, they are at an altitude of 82km, on the edge of space, and several times higher upContinue reading Noctilucent cloud season begins