Physics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..859c&link_type=abstract
Journal of Geophysical Research, vol. 87, Feb. 1, 1982, p. 859-866.
Physics
36
Dayglow, Electron Transitions, Nitrogen, Self Absorption, Spectral Bands, Ultraviolet Absorption, Absorption Spectra, Magnetic Dipoles, Molecular Absorption, Optical Thickness, Quadrupoles, Radiative Transfer
Scientific paper
Absorption by N2 of the Lyman-Birge-Hopfield (LBH) bands in the far ultraviolet dayglow is calculated using a line-by-line synthesis of individual bands. Included in the calculation are the effects of overlapping rotational lines and the combined magnetic dipole and electric quadrupole nature of the electronic transition. A band transmission function that can be used in the radiative transfer theory of any band in the system is presented for rotational and kinetic temperatures from 200 to 1000 K. Analysis of rocket observations of the LBH emissions in the 1250-1400 A region of the dayglow suggests that pure absorption by O2 dominates self-absorption except for the (6,0) band at 1275 A (where the horizontal slant intensity is reduced by 20%). The effect is significantly less than given in a previous analysis based on a band optical depth approximation.
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