Amateur sky watchers identified a new form of aurora borealis above Sweden that resembles sand dunes. In doing so, they actually helped scientists better understand a little-known zone of the Earth's atmosphere.
The group was discussing the phenomenon in the days after Palmroth's book was published, when one member pointed out that the mysterious phenomenon was happening at that very moment, outside their windows.
Maxime Grandin is one of the physicists on Palmroth's team. He was able to analyze the photographs using free software calledto pinpoint the tips of the dunes'"fingers" and calculate their azimuth and elevation, based on the location of the star located behind it. It turns out the amateur sky watchers had not only identified a new type of aurora – they had helped scientists illuminate a part of the Earth's atmosphere that isn't well known.
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