Lyman-alpha observations in the vicinity of Saturn with Copernicus

Details Lyman-alpha observations in the vicinity of Saturn with Copernicus Lyman-alpha observations in the vicinity of Saturn with Copernicus

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..383b&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 383-394.

Astronomy and Astrophysics

Astronomy

20

Lyman Alpha Radiation, Oao 3, Planetary Radiation, Radiant Flux Density, Saturn (Planet), Ultraviolet Astronomy, Calibrating, Hydrogen, Jupiter (Planet), Saturn Rings, Titan, Ultraviolet Spectrometers

Scientific paper

For the first time, high-resolution Ly-alpha observations of the Saturn vicinity were completed with the Princeton spectrometer on board the Copernicus satellite. They showed that near a minimum solar activity the emissions related to several sources are 250 + or - 50 rayleighs for the interplanetary medium in a near-downwind direction, less than 100 rayleighs for the rings, 200 + or - 100 rayleighs for a torus linked to the Titan orbit, and 1400 + or - 450 rayleighs for the disk of Saturn. These results induce some constraints through the corresponding theoretical evaluations: the B ring as the primary source of the atoms for the ring emissions; an efficient production mechanism for hydrogen atoms in the Titan torus; and a slightly larger eddy diffusion coefficient in the Saturn atmosphere than in the Jupiter atmosphere near solar minimum.

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