This sky looked delicious. Double auroral ovals were captured above the town
lights of Östersund, Sweden, last week. Pictured above, the green ovals
occurred lower to the ground than violet aurora rays above, making the whole
display look a bit like a cupcake. To top it off, far in the distance, the
central band or our Milky Way Galaxy slants down from the upper left. The
auroras were caused by our Sun ejecting plasma clouds into the Solar System
just a few days before, ionized particles that subsequently impacted the
magnetosphere of the Earth. Aurora displays may continue this week as an active
sunspot group rotated into view just a few days ago.
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