Further reading on Aurora colors -
https://www.lwpetersen.com/science-and-nature/what-causes-the-aurora/
https://atoptics.co.uk/blog/glowing-gases-aurorae/
https://www.researchgate.net/publication/233408329_The_Colors_of_the_Aurora
https://auroraborealisobservatory.com/2020/11/24/have-you-ever-seen-blue-aurora-borealis/
https://www.nps.gov/articles/-articles-aps-v8-i1-c9.htm
https://en.wikipedia.org/wiki/Aurora
http://ffden-2.phys.uaf.edu/webproj/212_spring_2015/Joyce_Dustin_Demientieff/joyce_dustindemientieff/colors.htmlhttp://ffden-2.phys.uaf.edu/webproj/212_spring_2015/Joyce_Dustin_Demientieff/joyce_dustindemientieff/colors.html
Note that 100 km is where space begins, aka the Kármán line. It is far above the highest clouds.
#Aurora
28/n
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