Neutral cometary atmospheres. I - an average random walk model for photodissociation in comets

Details Neutral cometary atmospheres. I - an average random walk model for photodissociation in comets Neutral cometary atmospheres. I - an average random walk model for photodissociation in comets

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..633c&link_type=abstract

Astrophysical Journal, Part 1, vol. 237, Apr. 15, 1980, p. 633-640.

Astronomy and Astrophysics

Astrophysics

71

Atmospheric Composition, Comet Heads, Mathematical Models, Photodissociation, Random Walk, Monte Carlo Method, Radiation Pressure, Radiative Transfer, Radicals, Comets, Atmosphere, Mathematical Models, Photodissociation, Velocity, Comet Heads, Brightness, Comparisons, Photochemistry, Parameters, Monte Carlo Techniques, Acceleration, Geometry, Density, Radiative Transfer, Radiation, Pressure

Scientific paper

A method for constructing physically realistic photochemical models, taking into account the isotropic ejection of dissociated molecular fragments as well as radiation pressure acceleration, has been developed using Monte Carlo techniques. The effect of the isotropic ejection, as opposed to the radial motion arbitrarily assumed in Haser's model, is adequately described by a simple average random walk model. It is shown that measured radial (Haser) scale lengths are in fact only lower limits to a range of possible true scale lengths for a given brightness profile, which explains the current discrepancies between observed scale lengths and those predicted by photochemistry.

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