Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265l..23s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 265, Feb. 1, 1983, p. L23-L27.
Astronomy and Astrophysics
Astronomy
12
Hydrogen Clouds, Iue, Jupiter Atmosphere, Lyman Alpha Radiation, Pioneer 10 Space Probe, Resonance Scattering, Spaceborne Astronomy, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Jupiter, Lyman-Alpha Radiation, Emissions, Observations, Iue, Hydrogen, International Ultraviolet Explorer, Brightness, Longitude, Concentration, Atmosphere, Data, Comparisons
Scientific paper
Observations of the Jovian H I Lyman-alpha emission have been made with the International Ultraviolet Explorer (IUE) observatory beginning in 1978 December, just before the time of the Voyager encounters, and extending through 1982 January. A nearly constant disk center brightness of about 8.5 kilorayleighs is observed for the central meridian longitude range lambda(III) = 200 to 360 deg and a variable brightness of between 9 and 15 kilorayleighs is found for the range lambda(III) = 50 to 150 deg. These brightness values have persisted throughout the three years of observation, and the hydrogen bulge near lambda(III) = 100 deg appears to be a fixed feature of the Jovian atmosphere. These results indicate that no substantial changes in the Jovian atomic hydrogen concentration or the average atmospheric conditions have taken place between the time immediately preceding the Voyager encounters and the present. The question of Jovian Lyman-alpha variability prior to 1978 is reexamined in the light of the IUE results.
Durrance Samuel T.
Feldman Paul D.
Moos Warren H.
Skinner Thomas E.
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