Green Light

I once remember hearing something about the sun throwing off a green band of light just before it sets. I am not sure if this is it but I was playing at the football game tonight and alas the green ray.. It doesn't show up in the frame before or the frame after and the the camera works fine. It think it is strange that the green light passed behind the tree if you look closely. Maybe this happens all the time.. but It's new to me..