The helium abundance of Jupiter from Voyager

Details The helium abundance of Jupiter from Voyager The helium abundance of Jupiter from Voyager

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8713g&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8713-8720.

Astronomy and Astrophysics

Astronomy

111

Atmospheric Composition, Helium, Infrared Spectra, Jupiter Atmosphere, Radio Occultation, Voyager 1 Spacecraft, Absorptivity, Abundance, Astronomical Models, Hydrogen, Temperature Profiles, Jupiter, Helium, Abundance, Voyager, Atmosphere, Infrared, Spectrum, Wavelengths, Procedure, Radio Occultations, Hydrogen, Absorption, Iris, Collisions, Data, Pressure, Techniques, Brightness Temperatures, Infrared Interferometry Spectrometer, Comparisons

Scientific paper

The helium abundance in the Jovian atmosphere is derived from Voyager 1 data by two methods. The first method uses only infrared spectra from selected locations on the planet while the second method uses a thermal profile independently derived from radio occultation measurements and infrared spectra recorded near the occultation point. A hydrogen mole fraction of 0.897 plus or minus 0.030 is obtained from the first method, while the second method gives 0.880 plus or minus 0.036, corresponding to helium mass fractions of 0.19 plus or minus 0.05 and 0.21 plus or minus 0.06, respectively. The estimated errors for the first method are primarily due to systematic uncertainties in the H2 and He absorption coefficients, while those for the second method result mainly from errors in the radio occultation profile and are less well known. Random errors in the measured infrared spectra are found to be negligible in both cases. The results are consistent with a uniform mix of hydrogen and helium within Jupiter's interior, but a modest amount of helium depletion (Delta Y equal to or less than 0.05) cannot be excluded.

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