Axisymmetric flow of reacting gas from a comet nucleus

Details Axisymmetric flow of reacting gas from a comet nucleus Axisymmetric flow of reacting gas from a comet nucleus

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..555v&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, July 1985, p. 555-560) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, July-Aug

Astronomy and Astrophysics

Astronomy

3

Axisymmetric Flow, Comet Nuclei, Gas Flow, Water Vapor, Brightness Distribution, Cometary Atmospheres, Dynamic Pressure, Mach Number, Photochemical Reactions

Scientific paper

The outflow of water vapor from a comet nucleus is considered, allowing for photochemical reactions and UV radiation transfer as well as an aspherical (axisymmetric) vaporization of material from the nucleus surface. The photometric structure of the cometary atmosphere is determined for the emission of H2O photodissociation products. Despite the spreading of gas outward from the comet-sun axis, the axial flow symmetry will persist to large distances from the nucleus, decisively affecting the dynamic-pressure and coma-brightness distributions, even though the radius and value of the inner-coma temperature minimum remain about the same as for spherically symmetric flow.

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