Dynamics of crust formation and dust emission of comet nucleus analogues under isolation

Details Dynamics of crust formation and dust emission of comet nucleus analogues under isolation Dynamics of crust formation and dust emission of comet nucleus analogues under isolation

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..221t&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 221-225 (SEE N90-19989 12-90)

Physics

Analogs, Comet Nuclei, Comets, Simulation, Stratigraphy, Surface Properties, Dust, European Space Programs, Planetary Mantles

Scientific paper

The lack of direct observations of near surface phenomena on cometary nuclei is one of the reasons of performing simulation experiments with various ice/dust mixtures under artificial insolation in the course of the KOSI (comet simulation) project. The objective of this project is a controlled simulation of processes that occur during the penetration of comets into the inner solar system (approximlately 1 AU). The experiments confirm that ice sublimation under insolation leads to the formation of an upper volatile free dust mantle covering a solidified dust/ice crust, both overlaying essentially unaltered material. The formation of a crust is explained by the inward diffusion and recondensation of gases. The outward gas flow gives rise to the emission of mantle particles in a size range of approximately 1 micron to approximately 1 cm. The emission process is ruled mainly by two different regimes: predominantly cohesion controlled and predominantly gravity controlled. Particle emission shows steep forward characteristics towards the light source and is consistent with the observation of dust jets of real comets.

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