Extended atmospheres of outer planet satellites and comets

Details Extended atmospheres of outer planet satellites and comets Extended atmospheres of outer planet satellites and comets

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aeri.reptr....s&link_type=abstract

Final Report, 1 Aug. 1984 - 31 Aug. 1988 Atmospheric and Environmental Research, Inc., Cambridge, MA.

Computer Science

Cometary Atmospheres, Hydrogen, Interplanetary Gas, Natural Satellites, Saturn Atmosphere, Abundance, Comet Nuclei, Coronas, Lyman Alpha Radiation, Outer Planets Explorers, Titan

Scientific paper

In the third year of this 3-year project, research accomplishments are discussed and related to the overall objective. In the area of the distribution of hydrogen in the Saturn system, new Voyager UVS data have been discovered and are discussed. The data suggest that both Titan's hydrogen torus and Saturn's hydrogen corona play a major role in the circumplanetary gas source. Modeling analysis of this new data establishes a strong basis for continuing studies to be undertaken in a new NASA-sponsored project. In the area of the cometary atmospheres, observational data for H, O, C, and OH acquired with the Pioneer Venus Orbiter are evaluated and preliminary modeling analysis for some of the hydrogen Lyman-alpha data is presented. In addition, the importance of collisional thermalization in spatial properties and structure of the inner and extended comae of comets has been demonstrated using the recently developed particle trajectory model. The successful simulation by this model of the hydrogen Lyman-alpha image for Comet Kohoutec near perihelion, an extreme case for collisional thermalization, is particularly noteworthy.

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