Evidence for Radiative Recombination of O+ Ions as a Significant Source of O 844.6 nm Emission Excitation

Photoelectron (PE) impact on ground‐state O(3P) atoms is well known as a major source of twilight 844.6 nm emission in the midlatitude thermosphere. Knowledge of the PE flux can be used to infer thermospheric oxygen density, [O], from photometric measurements of 844.6 nm airglow, provided that PE im...

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