Detection of the J-10 manifold of the pure rotational band of phosphine on Saturn

Details Detection of the J-10 manifold of the pure rotational band of phosphine on Saturn Detection of the J-10 manifold of the pure rotational band of phosphine on Saturn

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984abas.symp...76h&link_type=abstract

In its Airborne Astron. Symp. p 76-80 (SEE N85-17848 08-89)

Astronomy and Astrophysics

Astronomy

Molecular Rotation, Near Infrared Radiation, Phosphines, Planetary Composition, Saturn (Planet), Spectral Bands, Convection, Planetary Atmospheres, Pressure Measurement, Temperature Profiles

Scientific paper

The detection of the J = 10 manifold of the pure rotational band of PH3 on Saturn is reported. The observations were made from the far-infrared cooled grating spectrometer. The wavelengths and observed brightness temperatures for the full disk plus rings are 89 + or - 3 K at 97.04 micrometer, 77 + or - 3 K at 102.72 micrometer, 77 + or - 3 K at 102.94 micrometer, and 83 + or - 3 K at 105.12 micrometers. The points of 97.04 and 105.12 micrometers establish the continuum level and the two points near 103 micrometers measure the depth of the PH3 manifold. After the flux due to the rings is subtracted, the depth of the feature is 16 + or - 6 K relative to the nearby 102 K continuum. These results are compared to theoretical models which parameterize the PH3 mixing ratio as x = xzero (P/Pzero)(alpha) for P Pzero and as x = xzero for P or = P, where P is the total pressure and alpha = H/h is the ratio of the dynamical scale height (H) and the scale height for decreasing the PH3 mixing ratio (h). The parameters xzero, Pzero, and h were varied, as well as the H/He mixing ratio and the pressure-temperature profile. The data are well fitted using pressure-temperature profiles. The preferred values of h, Pzero, and xzero imply that there is little or no PH3 above the thermal inversion and that the mixing ratio below the inversion is consistent with PH3 being 1 to 4 times overabundant relative to the solar P/H ratio.

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