New upper limits for atmospheric constituents on Io

Uwe Fink, Harold P. Larson, Thomas N. Gautier

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A spectrum of the satellite of Jupiter, Io, from 0.86 to 2.7 μm at a resolution of 3.36 cm-1 and a signal to rms noise ratio of 120 is presented. No absorptions due to any atmospheric constituents on Io could be found on the spectrum. Upper limits of 0.12 cm-atm for NH3, 0.12cm-atm for CH4, 0.4cm-atm for N2O, and 24cm-atm for H2S were determined. Laboratory spectra of ammonia frosts as a function of temperature were compared with the spectrum of Io and showed as a frost not to be present at the surface of Io. A search for possible resonance lines of carbon, silicon, and sulfur as well as the 1.08μm line of helium proved negative and upper emission limits of 60, 18, 27, and 60 kilorayleighs, respectively, were established for these lines.

Original languageEnglish (US)
Pages (from-to)439-446
Number of pages8
Issue number3
StatePublished - Mar 1976

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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