Sources of cometary radicals and their jets - Gases or grains

Details Sources of cometary radicals and their jets - Gases or grains Sources of cometary radicals and their jets - Gases or grains

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...71..178c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 71, July 1987, p. 178-191.

Physics

46

Cometary Atmospheres, Free Radicals, Gas Jets, Grain Size, Halley'S Comet, Comet Nuclei, Cyanogen, Solar Planetary Interactions, Comets, Jetting, Gases, Grains, Source, Origin, Cn Radical, C2 Radical, Sputtering, Comet Nuclei, Solar Radition, Ultraviolet, Wavelengths, Comae, Size, Morphology, Hypotheses, Calculations, Diffusion, Models, Diagrams, Geometry, Distance

Scientific paper

The photosputtering of cometary CHON grains by solar UV radiation may furnish an inner coma source for the C atoms and C(+) ions observed in Comet Halley. A quantitative analysis is presented which constrains the size and/or morphology of the grains, together with a calculation giving attention to the dispersion of a trace gas jet in the cometary coma. Due to the large outflow speed and low temperature of the inner coma, a localized spatial region enriched in a trace parent gas will propagate radially outward while simultaneously diffusing and expanding, thereby preserving a jetlike appearance.

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