Cometary atmospheres [microform] : modeling the spatial distribution of observed neutral radicals / Michael R. Combi.
"Progress on modeling the spatial distributions of cometary radicals is described. The Monte Carlo particle-trajectory model was generalized to include the full time dependencies of initial comet expansion velocities, nucleus vaporization rates, photochemical lifetimes and photon emission rates...
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| Format: | Government Document Microfilm Book |
| Language: | English |
| Published: |
[Washington, DC] : [Springfield, Va.] :
[National Aeronautics and Space Administration] ; [For sale by the Clearinghouse for Federal Scientific and Technical Information],
[1985]
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| Series: | NASA contractor report ;
NASA CR-175882. |
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| Summary: | "Progress on modeling the spatial distributions of cometary radicals is described. The Monte Carlo particle-trajectory model was generalized to include the full time dependencies of initial comet expansion velocities, nucleus vaporization rates, photochemical lifetimes and photon emission rates which enter the problem through the comet's changing heliocentric distance and velocity. The effect of multiple collisions in the transition zone from collisional coupling to true free flow were also included. Currently available observations of the spatial distributions of the neutral radicals, as well as the latest available photochemical data were re-evaluated. Preliminary exploratory model results testing the effects of various processes on observable spatial distributions are also discussed."--NASA Technical Reports Server web site. Cometary atmospheres; Radicals; Spatial distribution; Comet nucle; Comet tails; Elastic scattering; Monte carlo method; Particle trajectories; Photochemical reactions; Radiation pressure; Solar radiation. |
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| Item Description: | "June 1985." |
| Physical Description: | 1 volume. |
| Reproduction Note: | Microfiche. |
| Funding Information Note: | Contract |
| Type of Report and Period Covered Note: | Annual report for the period June 1, 1984 to May 31, 1985. |