39 minutes ago
A i r g l o w
Colors in the darkest of nights... .
Airglow- The airglow is the light of electronically and/or vibration-rotationally excited atoms and molecules 80 km or higher.
The sun’s extreme ultraviolet light excites oxygen and nitrogen atoms and molecules in the thermosphere*. The energetic products collide and interact with other atmospheric components, including hydroxyl radicals (OH), to eventually produce light emission by chemiluminescence** and and decay of excited atoms and molecules.
Green light from excited oxygen atoms dominates the glow. The atoms are 90-100 km (56-62 mile) high in the thermosphere. The weaker red light is from oxygen atoms further up. Sodium atoms, hydroxyl radicals (OH) and molecular oxygen add to the light. - From Atmosphere Optics ...
I always thought something was wrong in my settings, turns out it’s just excited molecules colliding in the atmosphere...
* The more you know *
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