Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..856p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Aug. 1987, p. 856-859.
Physics
40
Cometary Atmospheres, Ion Motion, Magnetohydrodynamic Turbulence, Velocity Distribution, Giacobini-Zinner Comet, Halley'S Comet, Ion Scattering, Temporal Distribution, Comets, Ions, Hydromagnetics, Turbulence, Models, Giacobini-Zinner, Time Scale, Evolution, Velocity, Distribution, Ice Mission, Halley, Scattering, Formation, Spacecraft Observations, Diffusion, Comparsions, Spectra, Numerical Methods, Energy, Solar Wind
Scientific paper
By means of a test particle model, the time evolution of the velocity distribution function of newborn cometary ions in the presence of strong hydromagnetic turbulence is studied. The test particle model employs a realistic spectrum of hydromagnetic turbulence corresponding to the observations of the International Cometary Explorer spacecraft at Comet Giacobini-Zinner. It is found that pitch-angle scattering processes can rapidly result in the formation of the shell distribution which has been observed near Comets Giacobini-Zinner and Halley. The model also indicates that radial diffusion in velocity space develops on a much longer time scale.
Price Channon P.
Wu Shang-Chen
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