Very cool that that was caught on camera- I do photography and had known about this- it’s a very rare event to capture it on film because it happens very quickly
It’s a phenomena that not many are actually aware of
For more info and photos, here’s a link
http://earthsky.org/earth/can-i-see-a-green-flash
From the link
What makes a green flash? The green flash is the result of looking at the sun through a greater and greater thickness of atmosphere as you look lower and lower in the sky. Water vapor in the atmosphere absorbs the yellow and orange colors in white sunlight, and air molecules scatter the violet light. That leaves the red and blue-green light to travel directly toward you. Near the horizon, the sun’s light is highly bent or refracted. It’s as though there are two suns – a red one and a blue-green one – partially covering each other. The red one is always closest to the horizon, so when it sets or before it rises, you see only the blue-green disk – the green flash.
Thanks Bob434.
Thanks!