Monte Carlo modeling of the net effects of coma scattering and thermal reradiation on the energy input to cometary nucleus
Identifieur interne : 000901 ( Main/Exploration ); précédent : 000900; suivant : 000902Monte Carlo modeling of the net effects of coma scattering and thermal reradiation on the energy input to cometary nucleus
Auteurs : H. Salo [États-Unis]Source :
- Icarus [ 0019-1035 ] ; 1988.
Abstract
The light scattering in a spherically symmetric cometary dust coma is studied by the Monte Carlo method. The results indicate that the total energy input to the nucleus, Etot, is only weakly dependent on the coma opacity, τ, the radial distribution of the dust, n(r), or the phase function of the dust grains, characterized by the asymmetry factor g. In the case of conservative isotropic scattering, Etot (attenuated direct sunlight + multiply scattered radiation) is reducedat most by 30% for τ < 2 and n(r) ∼ 1 r2, as compared to the case with no dust coma. For highly forward directed scattering (g = 0.75), Etot is reduced even less, by only about 10% for the same τ interval. The use of n(r) ∼ 1 r3 density distribution does not significantly affect these results. The nonconservative scattering is modeled by assuming that all the absorbed visible radiation is reradiated at infrared wavelengths without subsequent extinction. It is found that due to the isotropic nature of thermal reradiation, it can only partially compensate for the decrease in the multiply scattered light. This results in a smaller Etot as compared to the case of conservative scattering with g = 0.75. Finally, the redistribution of flux between night and day hemispheres is found to be significant: typically, the total energy input to the night hemisphere is about one-fifth of that falling on the day side (for τ ≈ 1).
Url:
DOI: 10.1016/0019-1035(88)90071-1
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