The excitation of spectral lines in faint meteor trains

Physics

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Atmospheric Chemistry, Atmospheric Radiation, Ion Recombination, Line Spectra, Meteor Trails, Radiative Recombination, Atmospheric Ionization, Oxides, Spectrum Analysis

Scientific paper

The dissociative recombination of meteoric oxide ions in meteor trains is studied. Excitation probabilities for specific product states are determined, and approximate relative line strengths are obtained. Excitation through dissociative recombination and excitation in mutual neutralization are discussed. It is found that the main emitters of a typical stony meteor are five multiples of Fe, three of Mg, and one of Ca, with smaller contributions from several weaker multiplets of Fe and forbidden transitions of Si and Fe. Recombination lines are likely to dominate in the emission from trains of meteors fainter than a visual magnitude of about -5. Radiation occurring from mutual neutralization of meteoric ions by 0(-) ions is supposed to be due to two multiplets of Mg and two of Fe. At about 90 km the neutralization-induced photon output is expected to be an order of magnitude less than the recombination-induced photon output.

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