Quantitative Spectroscopy of the Aurora. III. The Spectrum of Medium Intensity Aurora Between 3100 Å and 4700 Å

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Abstract
Averaged spectra of medium intensity (I(4278 Å) ≈ 5 kR) and low intensity aurora (I(4278 Å) ≈ 0.5 kR) in the 3100–4700 Å region at a slit width of 3.5 Å are presented. A detailed composite synthetic spectrum has been prepared for comparison with the observed medium intensity spectrum to determine accurately the relative intensities of the prominent emission features. Included in the synthetic spectrum were the N2 Vegard–Kaplan and second positive systems, the N2+ first negative system, atomic line emissions, and a background continuum. Synthetic comparison spectra of the NO β and O2 Herzberg I systems were also prepared but no significant observed spectral features could be identified as belonging to either of these two systems. Several emissions in the 3300 Å region, each less than 2% of I(4278 Å), remain unidentified.

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