Blue auroras
Taken by Matti Helin on April 17, 2021 @
Southern Finland
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Details:
It was a beautiful display. Not particularly bright, but it sure was colorful.
The blue upper part is caused when sunlight ionizers nitrogen in the upper atmosphere. That combined with the particles from the sun create the light blue color.
Photographer's website:
https://Https://mattihelin.kuvat.fi
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