Green flash

I´ve been looking for the green flash during sunsets for a long time and I didn´t know that I actually captured one back in 2008.
Looking through old photos I found this shot during a lovely sunset at the island of Gotland over the Baltic Sea.
You can see the "green flash" at the top of the sun, this is an optical phenomena , read more here:  http://en.wikipedia.org/wiki/Green_flash