Observations of the J = 10 manifold of the pure rotational band of phosphine on Saturn

Details Observations of the J = 10 manifold of the pure rotational band of phosphine on Saturn Observations of the J = 10 manifold of the pure rotational band of phosphine on Saturn

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64..549h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 64, Dec. 1985, p. 549-556. NASA-supported research. Previously announced in STAR as N86-18277.

Other

2

Phosphines, Saturn (Planet), Saturn Atmosphere, Troposphere, Airborne Equipment, Atmospheric Composition, Gratings (Spectra), Infrared Spectroscopy, Resolution

Scientific paper

Saturn was observed in the vicinity of the J = 10 manifold of the pure rotational band of phosphine on 1984 July 10 and 12 from NASA's Kuiper Airborne Observatory with the facility far-infrared cooled grating spectrometer. On each night observations of the full disk plus rings were made at 4 to 6 discrete wavelengths which selectively sampled the manifold and the adjacent continuum. The previously reported detection of this manifold is confirmed. After subtraction of the flux due to the rings, the data are compared with disk-averaged models of Saturn. It is found that PH3 must be strongly depleted above the thermal inversion (approx. 70 mbar). The best fitting models consistent with other observational constraints indicate that PH3 is significantly depleted at even deeper atmospheric levels (or = 500 mbar), implying an eddy diffusion coefficient for Saturn of 10 to the 4 cm sq/sec.

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