A remote mine in Canada's Northwest Territory.
Auroras are caused by charged particles (mainly electrons) from space raining down on Earth's atmosphere, causing the air to glow where they hit. The most common shade is green; this is the color given off by oxygen 60+ miles above Earth's surface.
On April 6th, however, a burst of extra-energetic electrons penetrated the atmosphere deeper than usual reaching altitudes less than 60 miles. For such "low auroras," the temperature and density of air favor not the green glow of oxygen but the pink and purple shades of molecular nitrogen, hence the pink fringe
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