Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35.1317h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 35, Oct. 1987, p. 1317-1321. Research supported by the Norges Almenvitenskape
Physics
6
Atmospheric Temperature, Auroras, E Region, Molecular Ions, Molecular Spectra, Nitrogen, Oxygen, Visible Spectrum
Scientific paper
In this study a method is outlined which is capable of giving neutral temperatures and height changes in the aurora when the molecular emissions originate from the E-region. Absolute spectrometric measurements of N2(+) 1NG and O2(+) 1NG bands and the auroral green line are performed in a nightside aurora. Rotational temperatures and band intensities are deduced by a least-squares fit of synthetic spectra to observations. There is a close correlation between the variations in rotational temperatures and the relative intensity ratio of N2(+) 1NG(0,3) and O2(+) 1NG(1,0) bands. The change in the relative intensity ratio is similar to the intensity variation predicted by the changing N2 and O2 densities from 120 to 150 km, obtained from the MSIS 83 model atmosphere, and the derived neutral temperature variations are consistent with a similar change in emission height of the aurora. Therefore the changing temperature is most likely due to a changing emission height of the aurora, and no local heating can be inferred.
Deehr Charles S.
Henriksen Kim
Smith Reginald W.
Veseth Leif
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