A Tantalizing Hint of the Green Flash
For years I have looked for the "green flash" without success, but a view of one came at an unexpected time and location.
Watching through the viewfinder of the video camera, I was surprised to see the distinct green flash just before the sun disappeared. On the digital video camera, only two frames showed evidence of the green light, so only 1/15 of a second showed the phenomenon. To be sure, the image above is not very convincing, but if you look closely, you will see a hint of green at the top of the sun image. It was much more dramatic through the viewfinder. I never expected to be able to see it over a wooded mountain - I had heard reports only of sea views and views over bare rock mountains.
Atmospheric optics concepts
Meinel & Meinel
by Andrew Young