As the sun is setting that would suggest the possibility of the sunlight striking the cloud from a lower aspect thus creating a sort of northern lights effect on the dust particles in this particular cloud, as opposed to the earths ozone layer in the case of the nothern lights.Although it could be something paranormal or even an isolated case of some unnofficial government cloud seeding.First time i've visited your site by the way and I enjoyed reading about 9/11 something I have often thought was a set up just for an excuse to invade the middle east.
