The Mad and Terrible Arkansan

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From Astronomy Picture Of The Day; June 23, 2012:
Northern Green Flash Göran Strand
As seen from Frösön Island in northern Sweden the Sun did set a day after the summer solstice. From that location below the Arctic Circle it settled slowly behind the northern horizon. During the sunset’s final minute, this remarkable sequence of 7 images follows the distorted edge of the solar disk as it just disappears against a distant tree line, capturing both a green and blue flash. Not a myth even in a land of runes, the colorful but ellusive glints are caused by atmospheric refraction enhanced by long, low, sight lines and strong atmospheric temperature gradients.

From Astronomy Picture Of The Day; June 23, 2012:

Northern Green Flash 
Göran Strand

As seen from Frösön Island in northern Sweden the Sun did set a day after the summer solstice. From that location below the Arctic Circle it settled slowly behind the northern horizon. During the sunset’s final minute, this remarkable sequence of 7 images follows the distorted edge of the solar disk as it just disappears against a distant tree line, capturing both a green and blue flashNot a myth even in a land of runes, the colorful but ellusive glints are caused by atmospheric refraction enhanced by long, low, sight lines and strong atmospheric temperature gradients.