On Nov 19, 7:59*pm, Steve Hix
wrote:

Here are a couple of videos:http://www.atoptics.co.uk/atoptics/gfvid1.htm

Very cool video! Yes, I see why I could easily "wash out" the green
flash even if I could see it, camera exposure changed dramatically in
my 3 minute video, and even in the 30 second clip in my landing video,
just a slight tilt up or down made a dramatic difference in the sky
look.

Good study of the upper air charts would reveal inversion levels one
would think? But one thing I have noticed as a common denominator is
that most are seen over water rather then land.