Extreme ultraviolet observations from the Voyager 2 encounter with Saturn

Details Extreme ultraviolet observations from the Voyager 2 encounter with Saturn Extreme ultraviolet observations from the Voyager 2 encounter with Saturn

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sci...215..548s&link_type=abstract

Science, vol. 215, Jan. 29, 1982, p. 548-553.

Computer Science

128

Extreme Ultraviolet Radiation, Flyby Missions, Saturn Atmosphere, Voyager 2 Spacecraft, Absorption Spectra, Airglow, Auroras, Helium, Kilometric Waves, Planetary Temperature, Saturn Satellites, Stellar Occultation, Turbulent Diffusion, Ultraviolet, Reflectance, Collisions, Distribution, Satellites, Titan, Wavelengths, Distance, Brightness, Toruses, Saturn, Voyager 2, Hydrogen, Observations, Analysis, Airglow, Atmosphere, Ringlets, Spectrum, Data, Occultations, Mixing, Eddy Effects, Diffusion, Comparisons, M

Scientific paper

Combined analysis of helium (584 A) airglow and the atmospheric occultations of the star delta Scorpii imply a vertical mixing parameter in Saturn's upper atmosphere of K (eddy diffusion coefficient) of approximately 8 x 10 to the 7th sq cm per second, an order of magnitude more vigorous than mixing in Jupiter's upper atmosphere. Atmospheric H2 band absorption of starlight yields a preliminary temperature of 400 K in the exosphere and a temperature near the homopause of 200 K. Certain auroral emissions can be fully explained in terms of electron impact on H2, and auroral morphology suggests a link between the aurora and the Saturn kilometric radiation. Absolute optical depths have been determined for the entire C ring and parts of the A and B rings. A new eccentric ringlet has been detected in the C ring. The extreme ultraviolet reflectance of the rings is fairly uniform at 3.5 to 5 percent. Collisions may control the distribution of H in Titan's H torus, which has a total vertical extent of about 14 Saturn radii normal to the orbit plane.

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