In 1619, Galileo saw the Northern Lights, and named them aurora borealis after the Roman god of dawn and the Ancient Greek for northern wind.
They are caused by the interaction of the solar winds (travelling at 700 kms per second) with the earth’s magnetosphere (which deflects the solar wind), which is why most of the light is produced at least 60 miles above the ground, but can extend to over 600 miles.
Most displays are green because of high concentration of atomic oxygen and the eye’s higher sensitivity to green, but red, pink, blue, violet and yellow are also visible. Here we have wonderfully pure electric blues.
But...it's the sheer beauty of this image that really demands our attention, and digitally printed on silk it flows and shimmers a little like the Northern Lights themselves.