Mathematics – Probability
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1169c&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, Oct. 1989, p. 1169-1184.
Mathematics
Probability
22
Comet Nuclei, Giacobini-Zinner Comet, Ionization, Solar Wind, Bow Waves, Equations Of Motion, Ion Distribution, Ion Scattering, Linear Polarization, Magnetohydrodynamic Turbulence
Scientific paper
Ionization of cometary neutral molecules produces ions which are picked-up by the solar wind. The cometary ion pick-up process for Comet Giacobini-Zinner is studied using a test particle method in which trajectories are numerically calculated for several thousand ions whose initial locations were chosen randomly with probability proportional to the neutral density. The cometary ion distribution function was calculated at several locations upstream of the bow shock. Several types of magnetic fluctuations were included. Circularly and linearly polarized monochromatic waves result in less pitch-angle scattering of pick-up ions than turbulent fluctuations which have about the same amplitude. Some anisotropy remains in the distribution function just upstream of the shock, even for the turbulent fluctuations.
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