Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..249k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 249-252.
Physics
11
Comet Nuclei, Comet Tails, Gas Flow, Ice, Interplanetary Dust, Grain Size, Heat Transfer, Molecular Gases, Solar System
Scientific paper
The KOSI program of comet simulation experiments (Gruen and Kochan, 1990) being undertaken at DLR Koeln is examined from a theoretical perspective. In KOSI, specimens of water ice mixed with frozen CO2, methanol, and silicate dust are irradiated in a large vacuum chamber at cryogenic temperatures. The scales and symmetries involved in the experiments are compared with those of real comets, and particular attention is given to the mean free path, gas flow from the sample, the emission of dust-ice particles, and sample porosity. It is concluded that, although the KOSI experiments are unrealistic in a number of significant ways, they can still provide useful information about specific cometary processes; e.g., heat conductivity across ice-depleted nonvolatile materials, the effect of grain size, and the microscopic-scale features of gas emission.
Markiewicz Wojciech J.
Uwe Keller Horst
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