Rocket-borne spectroscopic measurements in the ultraviolet aurora - The Lyman-Birge-Hopfield bands

Computer Science – Sound

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Auroral Spectroscopy, Rocket Sounding, Spectral Bands, Ultraviolet Spectroscopy, Electron States, Emission Spectra, Molecular Spectroscopy, Nitrogen, Rocket-Borne Instruments

Scientific paper

Ultraviolet emissions from Earth's aurora were observed at wavelengths between 1675 and 2075 Å by a sounding rocket payload launched at Churchill, Canada, on March 28, 1980. The emissions from the Lyman-Birge-Hopfield and Vegard-Kaplan bands of N2 were observed and analyzed to determine the relative populations of the υ' = 0-6 levels of the a1πg state and the υ' = 4, 6, 7, and 8 levels of the A3Σg+ state, respectively. The relative population of higher vibrational levels of the A3Σg+ state are consistent with direct excitation and cascade. The relative populations of the vibrational levels of the a1πg state peak at υ' = 2. Such a distribution has not been observed previously in the aurora.

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