Pluto's extended atmosphere - an escape model and initial observations

Details Pluto's extended atmosphere - an escape model and initial observations Pluto's extended atmosphere - an escape model and initial observations

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992icar...95..173c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 95, Feb. 1992, p. 173-179.

Computer Science

5

Atmospheric Chemistry, Atmospheric Models, Hydrogen Atoms, Pluto Atmosphere, Upper Atmosphere, Brightness Distribution, Iue, Lyman Alpha Radiation, Methane, Molecular Clouds, Photodissociation

Scientific paper

The observational determination of the extent, escape rate, and composition of Pluto's upper atmosphere is presently approached via calculations of the rates of production and hydrodynamic outflow of atomic H generated by methane photodissociation. Observations have been conducted with the IUE in order to detect atomic H's Lyman-alpha emission in the conjectured cloud; these results are used to derive cloud-property upper limits as a function of the extent of the cloud. It is concluded that the extent and density of the hydrogen atmosphere is more dependent on the escape process than on the atmospheric fraction of methane.

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