Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1377g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1377-1387.
Physics
12
Auroral Spectroscopy, Radiative Transfer, Resonance Lines, Atmospheric Radiation, Oxygen Spectra, Ultraviolet Spectra
Scientific paper
A model is developed for simulating the 2D radiative transfer of resonance line emissions in auroras. The method of solution utilizes Fourier decomposition of the horizontal dependence in the intensity field so that the 2D problem becomes a set of 1D problems having different horizontal wavenumbers. The individual 1D problems are solved for using a Feautrier-type solution of the differential-integral form of the radiative transfer equation. In the limit as the horizontal wavenumber becomes much larger than the local line-center extinction coefficient, the scattering integral becomes considerably simplified, and the final source function is evaluated in closed form. The 2D aspects of the model are tested against results for nonresonance radiative transfer studies, and the resonance line part of the model is tested against results of existing plane-parallel resonance line radiative transfer codes. Finally, the model is used to simulate the intensity field of O I 1304 A for hard and soft auroras of various Gaussian horizontal widths. The results demonstrate the importance of considering the effects of 2D radiative transfer when analyzing auroral resonance line data.
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