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- W2372368257 abstract "A self-consistent multi-fluid solution of the dynamical and thermal structure of an H~O- dominated, two-phase dusty-gas cometary atmosphere has been obtained by solving the simultaneous set of differential equations representing conservation of number density, momentum and energy, together with the transfer of solar radiation in streams responsible for the major photolytic processes and the heating of the nucleus. The validity of this model, as in the earlier single-fluid ones, is restric- ted to the collision-dominated region where all the heavy species (ions and neutrals) are assumed to achieve a common temperature and velocity. However, recognizing that the photo-produced hydrogen is rather inefficient in exchanging energy with the heavier species we treat the hydrogen separately: it is assumed to be composed of a thermalized component (the second fluid) and a pre-thermal com- ponent. The present model, which is transonic due to the presence of the dust in the inner coma, causes the heavy species to expand subsonically from the nucleus and to smoothly traverse the sonic point within about 45 m of the nucleus, although the dust-gas coupling persists to about 50 km. While the tempera- ture of the heavy species goes through a strong inversion within about 100 km from the nucleus, due to the effects of IR cooling and expansion, it increases to about 300-400 K in the outermost part of the collision-dominated coma due to UV photolytic heating. These temperatures are smaller by a fac- tor of 2-3 from the predictions of the earlier single-fluid models, which assumed instant thermaliz- ation of the photo-produced hydrogen. While the velocities of the heavy species and the thermal hydrogen increase to, respectively, 1.1 km s -1 and 1.6 km s -1 in the outer (collisional) coma, the velocity of the pre-thermal component reaches about 15 km s -1. This latter value is consistent with Ly-a observations of a number of comets, which implies a fast (~ 20 km s -1) hydrogen component in the outer coma. The boundary of the exo- sphere, where the non-thermal hydrogen dominates, is predicted to be around 1.5 104km from the nucleus. The calculations are for a comet of radius 2.5 km with a dust/gas ratio of 1, at a heliocentric distance of I AU." @default.
- W2372368257 created "2016-06-24" @default.
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- W2372368257 date "1982-01-01" @default.
- W2372368257 modified "2023-09-27" @default.
- W2372368257 title "A MULTI-FLUID M ODEL OF AN H20-DOMINATED D USTY COMETARY A TMOSPHERE" @default.
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- W2372368257 hasPublicationYear "1982" @default.
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