Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95...69f&link_type=abstract
Astronomy and Astrophysics, vol. 95, no. 1, Feb. 1981, p. 69-79.
Astronomy and Astrophysics
Astrophysics
169
Astronomical Models, Comets, Gas Density, Molecular Gases, Neutral Gases, Density Distribution, Free Radicals, Molecular Collisions, Vector Analysis, Comets, Atmospheres, Density, Distribution, Comae, Gases, Models, Particles, Collisions, Data, Comparisons, Nucleus, Velocity, Dynamics, Molecules, Geometry
Scientific paper
It is noted that the density distribution of neutral molecules in cometary atmospheres is usually described by means of the Haser formula. The conditions governing the applicability of this formula are discussed, and the notion of collision sphere is investigated in detail. Depending on the value of the total production of gas in a comet, it may be necessary to consider different populations of molecules according to both the physical nature of their production zone and the nature of their production process. Generalizations of the Haser formula are presented. It is noted that a new (vectorial) model appears to be required to represent the density distribution of most radicals in comets.
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