Radiation formation of a nonvolatile crust

Details Radiation formation of a nonvolatile crust Radiation formation of a nonvolatile crust

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.269j&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 269-272 (SEE N

Physics

2

Comet Nuclei, Crusts, Radiation Effects, Cosmic Rays, Oort Cloud, Temperature Effects, Vacuum Effects

Scientific paper

Radiation effects on cometary materials, and mantle formation are discussed. Ion irradiation of the outer meters of a cometary surface produces new molecular species in the solid state. Because of the vacuum interfaces these segregate in an irreversible way into a nonvolatile residue and new very volatile species, which are lost directly or lost when the comet enters the inner solar system. It is, therefore, likely that a comet exposed to background radiations in the Oort cloud obtains an outer web of nonvolatile material which leads to the formation of a substantial crust (100 gm/sqcm). Except for fizzures and break-off of pieces due to warming of subsurface gases, this mantle should be continuously hardened for a periodic comet due, primarily, to thermal processing. There are also active regions which were shaded from cosmic ray radiation.

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