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Radiation Formation of a Non-Volatile Crust

Johnson, R. E. and Cooper, J. F. and Lanzerotti, L. J. (1986) Radiation Formation of a Non-Volatile Crust. In: 20th ESLAB symposium on the exploration of Halley's comet : proceedings of the international symposium, Heidelberg, Germany, 27-31 October 1986. ESA Special Publication. Vol.2. No.SP-250. European Space Agency , Paris, pp. 269-272.

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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 non-volatile 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 would obtain an outer web of nonvolatile material which will lead to the formation of a substantial 'crust' (~10^2 gm/cm^2). Except for fizzures and break-off of pieces due to warming of subsurface gases, this mantel should be continuously hardened for a periodic comet due, primarily, to thermal processing. There will also be active regions which were shaded from the cosmic ray radiation.

Item Type:Book Section
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Additional Information:Work supported by the NSF Astronomy Division.
Group:Space Radiation Laboratory
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NSF Astronomy DivisionUNSPECIFIED
Subject Keywords:comet crust; radiation modification
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Space Radiation Laboratory1986-14
Series Name:ESA Special Publication
Issue or Number:SP-250
Record Number:CaltechAUTHORS:20140430-092533314
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45347
Deposited By: SWORD User
Deposited On:30 Apr 2014 19:41
Last Modified:03 Oct 2019 06:29

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