Auroral resonance line radiative transfer
- Univ. of California, Berkeley (United States)
A model is developed for simulating the two-dimensional 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 two-dimensional problem becomes a set of one-dimensional problems having different horizontal wavenumbers. The individual one-dimensional 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 two-dimensional 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{sub I} 1,304{angstrom} for hard and soft auroras of various Gaussian horizontal widths. The results demonstrate the importance of considering the effects of two-dimensional radiative transfer when analyzing auroral resonance line data.
- OSTI ID:
- 5361710
- Journal Information:
- Journal of Geophysical Research; (United States), Vol. 97:A2; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
AURORAE
MATHEMATICAL MODELS
AIRGLOW
EMISSION SPECTRA
INTEGRALS
MORPHOLOGY
RADIATION TRANSPORT
RESONANCE
TWO-DIMENSIONAL CALCULATIONS
ULTRAVIOLET RADIATION
ELECTROMAGNETIC RADIATION
RADIATIONS
SPECTRA
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)