Spectrum of Uranus at 0.47-1.00 microns - A comparison with the simplest models of the formation of the CH4 absorption bands

Astronomy and Astrophysics – Astronomy

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Absorption Spectra, Albedo, Infrared Astronomy, Methane, Uranus Atmosphere, Atmospheric Models, Limb Darkening, Planetary Structure, Spectrum Analysis

Scientific paper

A comparison is made of the observed spectral geometrical albedo of Uranus with theoretical calculations for the three simplest models of the formation of absorption bands: simple reflection models, models with a homogeneous scattering semiinfinite aerosol layer, and models with a homogeneous semiinfinite Rayleigh atmosphere. The latter model assumes a dependence of the scattering coefficient on wavelength. It shows the best agreement with the geometrical albedo of Uranus both at the centers of weak and medium CH4 absorption bands and in the continuous spectrum between bands, where even relatively small CH4 absorption is sufficient to decrease the reflectivity of the planet to the observed values.

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