Computer Science
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1309k&link_type=abstract
Advances in Space Research, Volume 23, Issue 7, p. 1309-1318.
Computer Science
2
Scientific paper
The properties of cometary surfaces which influence the thermal behavior of the nucleus such as the albedo, the emissivity and the surface temperature are critically reviewed. It is shown that these properties are less firmly established than generally believed. A brief presentation is given of the state of the art in comet modelling. It is concluded that models which are supposed to give an adequate desription of cometary activity must take into account short term variations in local temperature due to the nucleus rotation and due to the orientation of the rotation axis. The activity can also be strongly influenced by the nucleus topography. If comets are porous it is further necessary to include all type of transport mechanisms of heat conduction, advection, local deposition and extraction of latent heat and all mechanisms of redistribution of volatile matter (advection, diffusion, sublimation, recondensation). For porous nuclei, no direct relationship between the coma composition and the abundance ratio in the nucleus can be established. An adequate description of the formation and growth of dust mantles can only be obtained from multdimensional models running over several revolutions with time steps much smaller than the rotation period.
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