About unidentified features in the Voyager far infrared spectra of Jupiter and Saturn

Details About unidentified features in the Voyager far infrared spectra of Jupiter and Saturn About unidentified features in the Voyager far infrared spectra of Jupiter and Saturn

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cajph..61.1455g&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 61, Oct. 1983, p. 1455-1461.

Astronomy and Astrophysics

Astronomy

16

Far Infrared Radiation, Helium Hydrogen Atmospheres, Infrared Astronomy, Jupiter Atmosphere, Saturn Atmosphere, Voyager 1977 Mission, Absorption Spectra, Brightness Temperature, Molecular Collisions, Planetary Radiation

Scientific paper

A study is presented of the two faint spectral features visible in Jupiter's spectra, which were recorded during the infrared interferometer experiment aboard the two spacecraft of the Voyager mission. It is noted that these features are located at the frequencies of the S(0) and S(1) pressure induced rotation lines of the free H2 molecule, and are superimposed over the absorption spectrum induced by collisions between H2-H2 and H2-He molecules. The results of this study demonstrate that these features are real and not measurement artifacts. The feature located at the S(0) frequency, which also exists in the Voyager spectra of Saturn, is shown to exhibit a complex shape, which is characterized by the lack of absorption in the continuum at 354.4/cm and a local excess of absorption over the continuum at 350.5/cm. The feature corresponding to the S(1) frequency is suggested to be due mainly to an absorption dip in the continuum at 587.1/cm. It is suggested that these features could be due to an intercollisional effect in the H2-H2 component.

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