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Titan's atmosphere from ISO mid-infrared spectroscopy

Lellouch, E.; Feuchtgruber, H.; Coustenis, Athena +5 more

We have analyzed Titan observations performed by the Infrared Space Observatory (ISO) in the range 7-30 µm. The spectra obtained by three of the instruments on board the mission (the short wavelength spectrometer, the photometer, and the camera) were combined to provide new and more precise thermal and compositional knowledge of Titan's stra…

The hydrogen ortho-to-para ratio in the stratospheres of the giant planets

Lellouch, Emmanuel; Fouchet, Thierry; Feuchtgruber, Helmut

Observations of the H ₂ S(0) and S(1) quadrupole lines in the four giant planets by the short-wavelength spectrometer of the Infrared Space Observatory are analyzed. These lines probe pressure levels located between 10 and 1 mbar and allow us to determine the stratospheric hydrogen para fraction for the first time. In Jupiter and Saturn…

Neptune's far-infrared spectrum from the ISO long-wavelength and short-wavelength spectrometers

Swinyard, Bruce M.; Orton, Glenn S.; Feuchtgruber, Helmut +4 more

Neptune was observed by the Infrared Space Observatory (ISO) Long-Wavelength Spectrometer (LWS) between 46 and 185 µm. At wavelengths between 50 and 110 µm the accuracy of these measurements is ⩽0.3 K. Observations of this planet made by the ISO Short-Wavelength Spectrometer between 28 and 44 µm were combined with the LWS data to…