ISO-SWS Observations of Uranus: the Stratospheric Distribution of C_2H_2

Details ISO-SWS Observations of Uranus: the Stratospheric Distribution of C_2H_2 ISO-SWS Observations of Uranus: the Stratospheric Distribution of C_2H_2

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.1512e&link_type=abstract

American Astronomical Society, DPS meeting #29, #15.12; Bulletin of the American Astronomical Society, Vol. 29, p.994

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The infrared spectrum of Uranus has been recorded between 7 and 16.5 mu m with the grating mode of the Short-Wavelength Spectrometer of the Infrared Space Observatory, with a resolving power of 1500. The spectrum shows no signal except in the C_2H_2 band centered at 13.7 mu m. From the absence of emission in the region of the CH_4 nu_4 band at 7.7 mu m, where the flux is lower than 0.5 Jy, an upper limit of 10(-7) can be estimated for the stratospheric mixing ratio of methane. The C_2H_2 band can be fitted with a stratospheric mixing ratio of 3 10(-8) . The CH_4 and C_2H_2 estimates mostly refer to the 1 - 100 mu bar region. Our calculations assume a thermal profile based upon Voyager UVS and radio data (Atreya et al, in "Uranus", U. Arizona, 1991). It should be noted that these results are very preliminary, and strongly depend upon the stratospheric thermal profile.

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