The helium abundance of Neptune from Voyager measurements

Details The helium abundance of Neptune from Voyager measurements The helium abundance of Neptune from Voyager measurements

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9618907c&link_type=abstract

Journal of Geophysical Research Supplement (ISSN 0148-0227), vol. 96, Oct. 30, 1991, p. 18,907-18,919.

Physics

44

Atmospheric Composition, Atmospheric Models, Cloud Cover, Helium, Neptune Atmosphere, Voyager 2 Spacecraft, Abundance, Infrared Spectrometers, Opacity, Stratosphere, Troposphere

Scientific paper

The He abundance in the Neptunian atmosphere is estimated using results from Voyager radio occultation and IR spectrometer measurements. It is found that the shape of the measured spectrum cannot be matched by spectra calculated from atmospheric models that include only gaseous opacity, indicating that there might exist an additional opacity source associated with clouds or hazes. The data obtained could be fit with either of the two general classes of horizontally homogeneous cloud opacity models: (1) a model consisting of a tropospheric cloud with an optical thickness at 200/cm between 1 and 8; and (2) a stratospheric cloud with an optical thickness between 0.2 and 0.8.

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