Computer Science
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...29..493g&link_type=abstract
Icarus, vol. 29, Dec. 1976, p. 493-507.
Computer Science
1
Atmospheric Composition, Atmospheric Models, Io, Planetary Atmospheres, Ammonia, Atmospheric Temperature, Density (Number/Volume), Nitrogen, Particle Energy, Pioneer 10 Space Probe, Planetary Ionospheres, Sodium Vapor, Thermal Conductivity
Scientific paper
Observations of Io suggest that it may have an atmosphere in which sodium vapor, ammonia, and nitrogen are important constituents. Several atmospheric models consisting of these gases are tested as a function of total content against the Pioneer 10 observations and for stability against escape. The results suggest that the atmosphere is very tenuous and that the interpretation of the ionosphere detected by Pioneer 10 by a static model may be inconsistent with the sodium-cloud observations. It is postulated that ionization may also be escaping and that sodium may be comparable in content in the atmosphere with some molecular constituent such as NH3 or N2. Sodium and this molecular component then dominate the atmosphere. It is also suggested that particle precipitation contributes to heating of the atmosphere and to the production of ionization; the difference between day- and nighttime ionospheres and possible trailing and leading side effects may relate to the nature of the particle energy distributions. These distributions may result from the peculiar interaction of Io with the Jovian magnetosphere.
Gross Stanley H.
Ramanathan G. V.
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