Ground-based observations of O2(b1Sigma g + - X to the 3rd Sigma g -) atmospheric bands in high latitude auroras

Details Ground-based observations of O2(b1Sigma g + - X to the 3rd Sigma g -) atmospheric bands in high latitude auroras Ground-based observations of O2(b1Sigma g + - X to the 3rd Sigma g -) atmospheric bands in high latitude auroras

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33..119h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Jan. 1985, p. 119-125. Research supported by the Great Norwegian-Spitsber

Computer Science

5

Auroral Spectroscopy, Emission Spectra, Oxygen Spectra, Polar Regions, Upper Atmosphere, Atmospheric Temperature, Diurnal Variations, Molecular Rotation, Molecular Spectra

Scientific paper

Analysis of observed spectrograms is based on comparison with synthetic spectra. The O2(b1Sigma g + - X to the 3rd Sigma g -) Atm.(1,1) band in high latitude auroras observed from the ground is found to be the strongest in the Delta v = 0 sequence. It is enhanced with altitude relative to the N2 1P(2,0) and N2(+) M(2,0) bands, but the O2 Atm.(2,2) band has an unexpected low intensity. The range of rotational temperatures of the O2Atm. bands varies from approx. 200 to above 500 K which indicates that the altitude of the centroid of the emission region varies from about 100 km to the F-region. The highest temperature is found in the midday aurora associated with the magnetospheric cusp. Conspicuous relative variations between the intensities of N2 and O2 spectra are documented, but a satisfactory explanation of the variety is not given. Deviations of the observed O2 Atm. band intensities from the vibrational intensity distribution predicted by Franck-Condor factors indicate that the excitation of the O2 Atm. bands in aurora is not mainly due to particle impact on O2, and the contribution due to energy transfer from hot O(1D) atoms has to be found in future research.

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