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 Satyandra K. 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. 

Volcanic Production of Sulfur Monoxide (SO) on Io

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 that

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 composition

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 was

Photochemistry of SO2 in the atmosphere of Io and implications on atmospheric escape

Photochemical models of Io's atmosphere are presented with the assumption that SO2 is the major gas and that the SO2 surface pressure is controlled by vapor-pressure equilibrium at the surface.

A model of the SO2 atmosphere and ionosphere of Io

The calculations of thermal structure for an SO2 atmosphere of Io lead to exospheric temperatures in 800-1200K range. The Pioneer 10 electron density profiles can be fit with an SO2 surface density

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.

The atmospheric abundance of SO2 on Io

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 from

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 ×



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 presence

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 following

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

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% of

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 observed

The atmosphere and ionosphere of Io

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 appears

Molecular fluxes in the lunar atmosphere

  • U. Vogel
  • Physics, Environmental Science
  • 1966