Mathematics – Probability
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.4911c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, June 1, 1983, p. 4911-4917. Research sponsored by the Aerospace Corp.
Mathematics
Probability
8
Auroras, Emission Spectra, Extreme Ultraviolet Radiation, Fine Structure, Oxygen Spectra, Radiative Transfer, Atomic Excitations, Electron States, Fabry-Perot Interferometers, Photons, Spectrum Analysis
Scientific paper
The auroral O I 7990-A multiplet intensity distribution has been observed by means of a 2-m grille spectrometer and a Fabry-Perot interferometer during 1977 and 1982, respectively, in Alaska. Grille spectrometer results indicate a nonstatistical distribution in the excited state, consistent with the preferential scattering of the O I 989-A EUV emission and in accord with recent radiative transfer calculations. A comparison of O I 7990-A intensities measured on the nightside with those from dayside magnetospheric cleft aurora shows a cascade contribution to the O I 8446-A line, and ultimately to the O I 1304-A transition, that depends on the altitude of the aurora. This is attributed to the greater radiative enhancement of O I 989-A at low altitude, and the correspondingly enhanced probability for branching from the 3 s-prime to the 3 p level in atomic O.
Christensen Andrew B.
Hecht James H.
Sivjee G. G.
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