This far north, almost to Anchorage, the sun was coming up about 4:00 am. This was one of the most unusual early morning sunrises I have seen and I have seen a lot. This phenomenon was visible for about ten minutes. But it slowly dimmed and then went away. I am guessing that the ray was visible because of the moisture in the air. Even though there did not appear to be any fog, the clouds were low enough to have this much moisture in the air but only visible with the bright morning sunlight.