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Airglow from the inner comas of comets

Authors:	TE Cravens AES Green

Institution:	University of Florida, Gainesville, Florida 32611, USA

Abstract:	The intensities of radiation from the inner comas of comets which are composed primarily of water and carbon monoxide have been calculated. Only “airglow” emissions initiated by the absorption of extreme ultraviolet radiation have been considered. The photoionizations of H₂O, CO, CO₂, and N₂ are the most important emission sources, although photoelectron excitation is also considered. Among the emission features for which intensities were calculated are H₂O⁺ ( $A ?^{2} A_{1?} X ?^{2} B_{1}$ ), CO⁺ (first negative), CO (fourth positive), CO (Cameron), CO₂⁺ ( $B ?^{2} ?_{u} ? X ?^{2} II_{g}$ ), N₂ (Vegard-Kaplan), N₂⁺ (first negative), and OI (1304 Å). In the inner coma (collision region) these airglow mechanisms are shown to be possible competitors with the usually assumed resonance scattering and flourescence excitation mechanisms which are appropriate for the outer coma and tail.

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