Evidence for change in particle excitation of Jupiter's atmosphere 1968-1979

Details Evidence for change in particle excitation of Jupiter's atmosphere 1968-1979 Evidence for change in particle excitation of Jupiter's atmosphere 1968-1979

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93...21s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 21-28.

Physics

7

Charged Particles, Jupiter Atmosphere, Lyman Alpha Radiation, Pioneer 10 Space Probe, Southern Hemisphere, Voyager Project, Jupiter, Charged Particles, Atmosphere, Spacecraft Observations, Spectra, Pioneer 10 Mission, Emissions, Brightness, Voyager 1 Mission, Ultraviolet, Wavelengths, Comparisons, Lyman-Alpha Radiation, Hydrogen, Abundance, Electroglow, Energy, Temperature, Thermosphere, Analysis, Iue Satellite, Satellite Observations, Optical Properties

Scientific paper

Analysis of the Pioneer 10 and rocket observations of disk averaged emission from the sunlit atmosphere of Jupiter indicates that the spectrally integrated EUV brightness was reduced by at least a factor of two relative to Voyager spacecraft observations in 1979. Most of the variation is caused by the H Ly-alpha component in the spectrum, which was reduced roughly one order of magnitude near the time of solar minimum in 1972-1973. Although the analysis of the data does not produce entirely consistent results, the weight of evidence points to a factor of order roughly two lower abundance of H in Jupiter's atmosphere in 1972-1973 relative to 1979. The low emission rate in H Ly-alpha near the time of solar minimum in this proposed scenario is caused by an electroglow energy depositon rate reduced by a factor of roughly three. The apparent reduced abundance of H implies a reduced thermospheric temperature, even under the assumption of a constant electroglow deposition rate.

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