The majority of auroral displays are predominantly green for two reasons, the first of which is that the human eye detects green more readily than other colours. This is why photographic images of the Northern Lights will often show colours that were not visible at the time to the naked eye.
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The color of the aurora depends on which gas is being excited ... Oxygen emits either a greenish-yellow light (the most familiar color of the aurora) or a red ...
Aug 23, 2023 · The Science Behind the Colors of Aurora · Green Light and Pale Yellow Lights - Collisions With Atomic Oxygen · Red Lights - Rare High Altitude ...