Computer Science
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..101..234h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 101, no. 2, p. 234-243.
Computer Science
16
Ammonia, Cometary Atmospheres, Halley'S Comet, Ion Production Rates, Methane, Photoelectrons, Electron Impact, Photoionization, Comets, Halley, Comae, Abundance, Methane, Ammonia, Auroras, Electrons, Ionization, Radiation, Comparisons, Ionosphere, Ions, Impact Effects, Density, Spacecraft Observations, Giotto Mission, Ims Instrument, Parameters, Production Rate, Models
Scientific paper
The coupled continuity equations for chemical steady state conditions in the Comet Halley coma are solved in order to study the role of auroral and photoelectrons on the abundances of CH4 and NH3. It is concluded that photoelectron impact ionization is an important source of ionization and plays a significant role in determining the densities of ions in the cometary coma. About 1.5 +/- 0.1 percent NH3 and 0.5 +/- 0.1 percent CH4 are required in the normal ionization case to obtain a reasonable fit to all the Giotto measured m/q ratio data simultaneously. The required concentration of NH3 is reduced in the case of enhanced ionization, but best-fit values of NH3 and CH4 in enhanced and normal ionization conditions remain the same.
Bhardwaj Anil
Haider S. A.
Singhal R. P.
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