Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..101..168c&link_type=abstract
Icarus (ISSN 0019-1035), vol. 101, no. 1, p. 168-171.
Computer Science
19
Atmospheric Composition, Helium, Neptune (Planet), Neptune Atmosphere, Nitrogen, Radio Occultation, Voyager Project, Infrared Spectra, Opacity, Radiative Transfer, Solar System Evolution, Neptune, Nitrogen, Atmosphere, Voyager 2 Mission, Spacecraft Observations, Abundance, Helium, Rss Instrument, Iris Instrument, Analysis, Models, Spectra, Troposphere, Stratosphere, Radio Methods, Refractivity, Uranus, Comparisons
Scientific paper
It is shown that N2 may be present in the troposphere of Neptune in an amount difficult to evaluate but which could easily be as high as 0.003, while there is no evidence that it is present in the atmosphere of Uranus. The estimate of the helium abundance depends on the assumed value for N2. If there is no N2 in the observed region of the atmosphere of Uranus and an N2 mole fraction of 0.003 on Neptune, the central value of the estimates of the helium abundance are equal to 0.26 by mass in both planets, which is close to the protosolar value of 0.28. This would imply that the He/H2 ratios measured in the outer atmospheres of Uranus and Neptune are representative of the ratio in the primitive solar nebula and thus were not modified during planetary formation.
Conrath Barney J.
Gautier Daniel
Owen Tobias C.
Samuelson Robert E.
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