Methane line profiles near 1.1 micron as a probe of the Jupiter cloud structure and C/H ratio

Astronomy and Astrophysics – Astrophysics

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Absorption Spectra, Atmospheric Models, Infrared Absorption, Jupiter Atmosphere, Line Spectra, Methane, Scattering Functions, Spectrum Analysis, Jupiter, Methane, Clouds, Structure, Element Ratios, Carbon, Data, Hydrogen, Atmospheres, Scattering, Absorption, Interferometry, Spectrum, Abundance, Gases, Particles, Phases, Reflectivity, Models, Albedo, Altitude, Distribution, Procedure, Pressure, Photons, Parameters, Comparisons, Optical Properties, Thickness

Scientific paper

Recent laboratory measurements have made it possible to study the line profiles due to methane absorptions near 1.1 micron in the spectrum of Jupiter by considering not only the strong lines of the 3nu3 band but also many other lines of weaker intensities. Profiles of more than 40 lines of CH4 within the same spectral interval are analyzed in a high-resolution interferometric spectrum of Jupiter recorded by Connes and Maillard in 1974. The absorption by the dipole band of hydrogen in the same spectral region is taken into account. Scattering models with one and two clouds are investigated. Based on line shape considerations, it is found that, for all models studied, the radiation at 1.1 micron comes essentially from pressure levels higher than 1.5 atm and that a large number of scattering particles quite high in the atmosphere (about 0.2 atm) is required. The C/H ratios derived are of the order of (1.5 plus or minus 0.7) x 10 to the -3rd, corresponding to 3.2 plus or minus 1.5 times the solar value given by Lambert (1978).

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