Irradiation effects in a comet's outer layers

Details Irradiation effects in a comet's outer layers Irradiation effects in a comet's outer layers

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617553j&link_type=abstract

(International Conference on Laboratory Research for Planetary Atmospheres, 2nd, Charlottesville, VA, Oct. 21, 1990, Proceedings

Physics

12

Atmospheric Composition, Cometary Atmospheres, Cosmic Rays, Refractory Materials, Water, Atmospheric Chemistry, Cosmochemistry, Ice, Oort Cloud, Organic Compounds, Ortho Para Conversion

Scientific paper

Laboratory data and cosmic ray doses are used to understand the irradiation-induced formation and destruction of organics in the outer layers (mantle) of a comet in the Oort cloud and for determining the fate of volatiles in the mantle. This is used to estimate the change in the orthowater/parawater ratio with depth in the outer layers of a new comet and the average thickness of the refractory part of the mantle of a new comet. Because comets will have large-scale irregularities, regions of the mantle will be unstable, leading to enhanced activity on a new comet and producing 'permanently' active regions.

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