Voyager U.V. spectrometer observations of He 584 A dayglow at Jupiter

Details Voyager U.V. spectrometer observations of He 584 A dayglow at Jupiter Voyager U.V. spectrometer observations of He 584 A dayglow at Jupiter

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..283m&link_type=abstract

Planetary and Space Science, vol. 29, Mar. 1981, p. 283-292.

Astronomy and Astrophysics

Astronomy

19

Dayglow, Helium, Jupiter Atmosphere, Planetary Radiation, Ultraviolet Astronomy, Atmospheric Models, Hydrogen, Spectroscopic Analysis, Upper Atmosphere, Voyager Project, Jupiter, Dayglow, Spectrometry, Observations, Voyager 1, Voyager 2, Ultraviolet, Wavelengths, Spectrum, Helium, Intensity, Brightness, Lyman-Alpha Radiation, Atmosphere, Models, Resonance, Scattering, Hydrogen, Emissions, Data, Geometry, Diagrams, Altitude, Longitude, Comparisons, Temperatures, Hypotheses, Thermosphere

Scientific paper

The intensity of Jupiter's He 584 A airglow has been measured by the Voyager UV spectrometers. The disk-averaged brightness is about 4 Rs and limb darkening is present. The intensity probably varies with longitude, the variation being out of phase with the H Lyman-alpha intensity bulge. Modelling of resonance scattering of the solar He 584 A line by Jupiter's atmosphere has shown that the hydrogen and helium emissions can be explained about equally well by at least two self-consistent scenarios involving the structure (temperature and eddy diffusion coefficient) and excitation of the atmosphere. All evidence points to a dramatic change of conditions in the Jovian atmosphere in the time between Pioneer and Voyager encounters.

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