Identification of gaseous SO2 and new upper limits for other gases on Io

  title={Identification of gaseous SO2 and new upper limits for other gases on Io},
  author={John Christopher Pearl and Rudolf A. Hanel and Virgil G. Kunde and William C. Maguire and Karl August Fox and Satya Kumar Gupta and Cyril Ponnamperuma and François Raulin},
Gaseous SO2 has been identified on Io. The estimated abundance of 0.2 cm atm is consistent with an atmosphere in equilibrium with solid SO2 at the local surface equilibrium temperature. Preliminary upper limits for several gases, including sulphur compounds and other terrestrial volcanic emissions have been derived. Io is apparently depleted in hydrogen, carbon and nitrogen. 
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Abstract We use thermochemical equilibrium calculations to show that SO is expected in volcanic gases erupted on Io, and derive the range of temperatures, pressures, and elemental compositions thatExpand
Predicted Abundances of Carbon Compounds in Volcanic Gases on IO
We use chemical equilibrium calculations to model the speciation of carbon in volcanic gases on Io. The calculations cover wide temperature (500-2000 K), pressure (10-8 to 10+2 bars), and compositionExpand
An upper limit to the global SO2 abundance on Io
Gaseous sulphur dioxide has been detected on Io by the Voyager 1 IRIS experimemt1. It was associated with a major volcanic plume, and it was observable only because the local underlying surface wasExpand
New measurements of the infrared spectrum of solid SO2: Applications to IO
Abstract We present the results of additional studies of the 6–10 μm spectrum of solid SO 2 formed under a variety of deposition temperatures and deposition rates. Our and other published spectraExpand
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A model of the SO2 atmosphere and ionosphere of Io
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Sulfur and oxygen escape from Io and a lower limit to atmospheric SO2 at Voyager 1 encounter
It is proposed that the transport of material from Io to the plasma torus requires the presence of an atmosphere as an intermediate buffer. Direct escape of volcanic SO2 is expected to be negligible.Expand
The atmospheric abundance of SO2 on Io
Abstract Near-ultraviolet spectra of Io have been obtained for the first time at high-resolution with the International Ultraviolet Explorer (IUE) satellite in order to determine the SO 2 abundanceExpand
Oxidation State of Volcanic Gases and the Interior of Io
Abstract We used thermochemical equilibrium calculations to constrain the oxygen fugacity ( f O 2 ) of volcanic gases on Io. Three types of calculations were done: (1) Upper limits for f O 2 fromExpand
The Atmosphere of Io: Abundances and Sources of Sulfur Dioxide and Atomic Hydrogen
An analysis and interpretation of reflected solar Lyman α intensity data acquired with the Hubble Space Telescope (HST) implies an equatorially confined atmosphere with SO2 column densities ∼ 1–2 ×Expand


New upper limits for atmospheric constituents on Io
Abstract 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 atmosphericExpand
The role of SO2 in volcanism on Io
Io and Earth are the only planetary bodies known to be volcanically active; the energetics of the eruptive plumes on Io have important structural implications and are closely linked with the presenceExpand
Upper limits for an atmosphere on Io
Abstract The 14 May 1971 occultation β Scorpi C by Io was successfully observed in ultraviolet light near Kingston, Jamaica. Within the limits established by time resolution and the signal-to-noiseExpand
AFCRL atmospheric absorption line parameters compilation
Abstract : The report describes a compilation of the molecular spectroscopic parameters for a number of infrared-active molecules occurring naturally in the terrestrial atmsophere. The followingExpand
The stability of an SO2 atmosphere on Io
Measurements of Io's volcanism and the plasma torus suggest that SO2 is a major constituent of its atmosphere.
Formation of the lunar atmosphere
  • R. Hodges
  • Environmental Science, Materials Science
  • 1974
Measurements of40Ar and helium made by the Apollo 17 lunar surface mass-spectrometer are used in the synthesis of atmospheric supply and loss mechanisms. The argon data indicate that about 8% ofExpand
Io's atmosphere and ionosphere: New limits on surface pressure from plasma models
The paper studies charge particle impact as a mechanism for the production of Io's ionosphere. Pioneer 10 thermal plasma measurements and magnetospheric plasma models which explain the observedExpand
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A variety of models for Io's atmosphere, ionosphere, surface, and environment are developed and discussed in the context of recent observational data. The sodium emission detected by Brown appearsExpand
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Abstract The infra-red spectrum of gaseous sulphur trioxide has been recorded in the region 400–4000 cm −1 . Three infra-red active fundamentals have been found in agreement with the generallyExpand
Molecular fluxes in the lunar atmosphere
Abstract The properties of a neutral lunar atmosphere are investigated theoretically. A non-uniformity is shown to result from the temperature variations and non-uniform gas source distribution onExpand