Fluorescence in the 3μm bands of methane on Jupiter and Saturn from ISO/SWS observations

Physics

Scientific paper

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Planetary Atmospheres

Scientific paper

Observations of Jupiter and Saturn with ISO Short Wavelength Spectrometer (SWS) show emission features in the range between 3.2-3.4 μm, at the level of a few Jansky. These emissions can be interpreted as due to fluorescence scattering of solar light with frequency redistribution within the vibrational spectroscopic bands of CH4. The main emission is observed within the fundamental ν3 band of methane, with the characteristic P, Q and R branches of the vibration/rotation band; emission in the overtones of methane corresponding to absorption of sunlight at 2.3 and 1.7 μm are also detected. This observation provides the first detection of the infrared fluorescence of methane in the giant planets. Its interpretation constrains the atmospheric levels close to the homopause, with a new determination of the eddy diffusion coefficient at the homopause.

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