this post was submitted on 12 Oct 2024
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AskScience: Got Questions? Get Answers.

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The original post: /r/askscience by /u/zed_three on 2024-10-11 21:33:29.

Everything I can find says red aurora is due to low concentrations of oxygen at higher altitude, whereas green aurora is due to higher concentrations at lower altitude. That's quite an unsatisfying explanation though.

What exactly is the mechanism for exciting different wavelengths at different altitudes?

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