Consequences of cometary aurora on the carbon chemistry at comet P/Halley

Details Consequences of cometary aurora on the carbon chemistry at comet P/Halley Consequences of cometary aurora on the carbon chemistry at comet P/Halley

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...31b&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 16, no. 2, p. (2)31-(2)36

Astronomy and Astrophysics

Astronomy

7

Auroras, Carbon, Comet Nuclei, Electron Impact, Electron Precipitation, Halley'S Comet, Astronomical Models, Carbon Monoxide, Photodissociation, Solar Wind

Scientific paper

Various experimental data acquired during the visit of Halley's comet in 1986 have shown that the amount of carbon produced due to photodissociation of parent carbon bearing species is not enough to explain the observations. This requires the presence of an additional source of atomic carbon. One possible source could be auroral-type activities resulting from the precipitation of high-energy 'auroral electrons' of solar wind origin, the evidence of which has been inferred from many observations of comet Halley. We have developed a coupled chemistry-transport model to study the role of auroral and photoelectron impact as well as the chemistry of the modeling of carbon in the inner coma (less than or equal to 104 km) of comet Halley. Our study suggests that electron impact dissociation of CO is the major source of carbon production in the inner coma, not the recombination of CO(+) as suggested by earlier workers, while transport is the main loss process.

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