Physics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15...19l&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 10, p. 19-28
Physics
Carbon Dioxide, Dust, Ice, Space Environment Simulation, Sublimation, Water, Chemical Analysis, Comet Nuclei, Comets, Mass Spectroscopy, Temperature Effects
Scientific paper
In the KOmetenSImulation (KOSI) project decimeter-sized porous ice/dust mixtures were investigated in a simulated space environment. A variety of experimental techniques was applied for simultaneous in situ measurements of parameters of the interior, the surface, and emissions of the inosolated samples. Sublimation rates declined in all cases when the dust/ice ratio was approximately 0.1 or more, indicating formation of a dust mantle. At a lower dust/ice ratio of 0.02 sublimation rate was constant indicating erosion of the dust from the surface. Investigations on mixtures of H2O and CO2 ices coordinating results from mass spectrometric, chemical and temperature analyses showed that inbound flow of sublimated CO2 is significant (approximately 50 percent). Inbound flow of H2O vapor was studied by isotopic tracing; the results stress the importance of texture changes by grain sintering for the enhancement of thermoconductivity. The process of dust mantle formation was observed, by IR mapping of surface temperatures, to be inhomogeneous with local fluctuations of growth and erosion alternating. From measured dynamic parameters of ejected particles, conclusions on the importance of cohesive forces in relation to gravity and gas drag could be drawn.
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