Voyager ultraviolet stellar occultation measurements of the composition and thermal profiles of the Saturnian upper atmosphere

Astronomy and Astrophysics – Astronomy

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Saturn Atmosphere, Stellar Occultation, Ultraviolet Astronomy, Voyager Project, Atmospheric Composition, Atmospheric Temperature, Gas Density, Hydrogen, Upper Atmosphere, Vertical Distribution

Scientific paper

Occultation of the star Delta-Scorpii by Saturn as recorded by the Voyager Ultraviolet Spectrometer yields the value of the exospheric temperature in the equatorial region to be 800 (+150, -120) K at an altitude of 1540 km above the 1-bar atmospheric pressure level; the H2-density at 1540 km is determined to be 5 (+3.6, -1.8) x 10 to the 9th per cu cm. Temperature gradient in the thermosphere is found to be 1.25 (+0.05, -0.07) K/km. Methane volume mixing ratio at 965 km above the 1-bar pressure level is determined to be 0.00015.

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