Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93..341h&link_type=abstract
Astronomy and Astrophysics, Vol. 93, P. 341, 1981
Astronomy and Astrophysics
Astrophysics
43
Scientific paper
It is investigated how optical screening of the solar radiation by the dust atmospheres of comets can influence their production rates of gas and dust. With the aid of generalized Probstein hydrodynamics we obtain the structure of the dust coma near the nucleus using the Sekanina-Miller particle size distribution. A numerical scheme of a radiation transfer calculation is developed, which takes into account both the anisotropical scattering functions from Mie theory and the multiple scattering of the solar radiation. So we get an effective optical thickness τeff, which describes the extinction of the dust halo. With this τeff we obtain a new temperature at the surface of the nucleus which leads to a new production rate of the dust, a new dust profile in the halo and again to a new τeff etc. Numerical calculations show that this procedure converges after a few iterations giving the final production rates of gas and dust, which are now modified by the optical thickness effects.
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