Emission spectrum of Atomic Oxygen

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   AkaSci 🛰️ (akasci@fosstodon.org)'s status on Sunday, 12-May-2024 17:45:56 JST AkaSci 🛰️

   in reply to

   What's up with Atomic Oxygen emissions in red and green?

   O is unusual in terms of its return to ground state after excitation: it takes ~0.7 sec to emit the green light and up to 2 mins for red.
   - At low altitudes, collisions with other atoms or molecules absorb the excitation energy and prevent emissions.
   - At high altitudes, O density is v low which allows time for oxygen to emit red light.
   - At 100-200 km, O density is sufficiently low to allow green emission.

   https://en.wikipedia.org/wiki/Aurora
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