Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnt...16..497a&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, vol. 16, no. 6, p. 497-506
Physics
Scientific paper
The paper concerns with the evolution of the thermal properties of comet grains when their thermal equilibrium is disturbed. The problem is based on two assumptions regarding the initial temperature deviation: fixed initial deviation and its maximum values (according to the model of dust particle breaking). The temperature relaxation time of a dust particle for the maximal initial temperature deviation is calculated on the basis of the equation defining the dust particle heat variations in the solar radiation field. The nonequilibrium thermal radiation of the pure water ice particles as well as of the particles polluted by silicates or carbon was studied. When breaking up, the water/carbon ice particles practically stay at the thermal equilibrium. On the contrary, after breaking down pure water ice particles with a size of 10-100 μ m and those polluted by silicates can be at the thermal nonequilibrium for a rather long time. Thermal emission variations of dust particle averaged over relaxation time are asymmetrical about the equilibrium value due to a substantially different contribution from cooling and heating particles. The thermal emission differs from the equilibrium one by a factor of 100 at 3 μ m.
Andrienko D. P.
Mischishina I. I.
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