High spectral resolution observations of Jupiter between 30 and 50 microns

Astronomy and Astrophysics – Astronomy

Scientific paper

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Ammonia, Hydrogen, Infrared Astronomy, Infrared Spectroscopy, Jupiter Atmosphere, Spectral Resolution, Calibrating, Far Infrared Radiation, Ice, Ice Clouds, Opacity, Spectrum Analysis, Jupiter, Observations, Spectrum, Comparisons, Thermal Properties, Ice, Resolution, Ammonia, Tropopause, Stratosphere, Structure, Clouds, Wavelengths, Atmosphere, Infrared, Spectroscopy, Brightness Temperature, Data, Hydrogen, Interferometer, Kao, Procedure, Equipment, Models, Absorption Bands, Opacity

Scientific paper

New spectral observations of Jupiter in the 220-350/cm range at 0.31/cm resolution are presented. The observations, after calibration, are compared to previously published measurements in this spectral range. Synthetic spectra, including opacity from H2 and NH3, have been computed for comparison with the observations. Calculations have been also performed introducing an NH3 ice cloud at the 148 K level. The measurements are consistent with previously retrieved jovian thermal profiles except that a warmer tropopause is found. The high resolution structure measured in the ammonia band cores is indicative of a strong NH3 depletion in the stratosphere. The presence of an ammonia haze in the upper troposphere would significantly affect the jovian spectrum at wavelengths greater than 35 microns; consequently, an accurate retrieval of the thermal profile in this part of the jovian atmosphere requires knowledge of the size distribution and number density of NH3 ice particles.

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