The 'dunes' can be found at an altitude of around 62 miles in the upper part of an atmospheric layer known as the mesosphere.
Palmroth and colleagues say that a special type of atmospheric gravity wave—ripples in the sky formed when buoyancy pushes air up, and gravity pulls it back down—are crucial to the formation of the novel aurora.
By chance, the unidentified auroral form appeared again just days after the book was published and photographers immediately notified Palmroth who started to investigate. Images were snapped of the unidentified aurora form in two locations in southwestern Finland, both of which displayed common characteristics. Furthermore, Palmroth and her colleagues used astronomical software to work out the altitude and extent of the phenomenon.
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