Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226..318d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 318-334.
Astronomy and Astrophysics
Astrophysics
Halley'S Comet, Kepler Laws, Molecular Ions, Astronomical Models, Interplanetary Space, Ionization, Radiation Pressure, Water
Scientific paper
A method is presented for calculating the fluxes of cometary ions at large distances from the nucleus. Its essential feature is that the source neutral particles leave the comet with a given relative speed and move to the point of interest along Kepler trajectories. The effects of ionization losses and radiation pressure are also included. Calculations are made for Comet Halley for water group particles (H2O, O, OH) and for hydrogen as dissociation products of H2O and OH. The ion fluxes from these species are found by integrating along solar wind streamlines. Comparisons with the simple Haser model for neutral densities (constant relative velocity) show that, for the slower species (less than 10 km/s), substantial differences exist at distances greater than 1.5 Gm, but that for the fast hydrogen (ejection speed = 20 km/s), the Haser model yields a reasonable approximation out to 20 Gm.
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