Methane and ammonia content in the atmosphere of Saturn

Astronomy and Astrophysics – Astronomy

Scientific paper

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Abundance, Ammonia, Atmospheric Composition, Methane, Planetary Atmospheres, Saturn (Planet), Absorption Spectra, Aerosols, Astronomical Models, Atmospheric Attenuation, Atmospheric Models, Optical Thickness, Spectrum Analysis

Scientific paper

Photoelectric measurements of the intensities of the 6190-A and 7250-A methane absorption bands in the equatorial and south temperate zones of Saturn are used together with an estimated equivalent width for the 6457.1-A ammonia line to determine parameters of a two-layer model for that planet's atmosphere. The equivalent thickness of CH4 in the atmosphere above the clouds is estimated, and equivalent CH4 and NH3 absorption paths along scattering mean and unit free paths within the cloud layer are derived. A relative NH3 concentration within the cloud layer is obtained which does not contradict radio-astronomical estimates of the NH3 content in the subcloud layer.

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