The height, spectrum and mechanism of type-B red aurora and its bearing on the excitation of O(S-1) in aurora

Details The height, spectrum and mechanism of type-B red aurora and its bearing on the excitation of O(S-1) in aurora The height, spectrum and mechanism of type-B red aurora and its bearing on the excitation of O(S-1) in aurora

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33..207g&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Feb. 1985, p. 207-221.

Computer Science

35

Atomic Excitations, Auroral Spectroscopy, Auroras, Oxygen Atoms, Vibrational Spectra, Atmospheric Models, Atomic Spectra, Height, Spectrograms, Television Cameras

Scientific paper

Using TV cameras at two ground stations, the height of the lower red border of type-B aurora is determined by triangulation. A mean measured height of 91.4 km with a mean deviation of 1.1 km is determined from a set of twelve measurements made under ideal conditions. Possible changes in the relative intensities of the bands of N2 1P system in the 6000-7000 A region are tested using a TV spectrograph. No significant difference is found in this distribution between the spectra from 93 and 122 km. The height distribution of contributions to the OI 5577 A emission relative to the N2(+) First Negative emission is modeled from 80 to 160 km. Contributions from electron impact on atomic O, O2(+) dissociative recombination and N2(A)-O energy transfer are included. Recent laboratory data on O(S-1) quenching is considered. It is shown that substantial reductions in the intensity of OI 5577 A occur below 100 km but that the exact results above 115 km are sensitive to the neutral atmospheric composition. The lifetime of O(S-1) in type-B red auroral rapid time variations is about 0.5 s. It is possible to reproduce the observed time variation by introducing additional quenching by NO and by reducing the yield of O(S-1) from the O2(+) dissociative recombination reaction.

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