The 15 August 1980 occultation by the Uranian system - Structure of the rings and temperature of the upper atmosphere

Details The 15 August 1980 occultation by the Uranian system - Structure of the rings and temperature of the upper atmosphere The 15 August 1980 occultation by the Uranian system - Structure of the rings and temperature of the upper atmosphere

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...52..454s&link_type=abstract

Icarus, vol. 52, Dec. 1982, p. 454-472. Research supported by the Observatoire de Paris and Universite de Paris; Centre Nationa

Physics

11

Atmospheric Temperature, Planetary Structure, Stellar Occultation, Uranus Atmosphere, Uranus Rings, Brightness Temperature, Light Curve, Numerical Integration, Temperature Profiles

Scientific paper

A stellar occultation by Uranus and its rings on August 15, 1980 is discussed. The nine rings were observed, and the profiles of rings alpha, beta, and epsilon were resolved; ring alpha exhibited a double structure. Strong diffraction peaks were visible in the gamma ring profile, suggesting an opaque ring with very sharp edges. A broad and faint structure extends outward from the eta ring on a radial scale of about 55 km. A temperature profile of the upper atmosphere of Uranus was obtained. The temperature is close to 145 plus or minus 10 K at the 0.03 mbar pressure level and is nearly constant in the pressure interval from 0.01 to 0.01 mbar. The thermal inversion is as strong as the inversion on Neptune but is located at higher altitudes. This high stratospheric temperature is consistent with the upper limit of the brightness temperature at 8 microns only if CH4 follows its saturation law.

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