Comparison of observed and calculated implanted ion distributions outside Comet Halley's bow shock

Details Comparison of observed and calculated implanted ion distributions outside Comet Halley's bow shock Comparison of observed and calculated implanted ion distributions outside Comet Halley's bow shock

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9467g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9467-9477. SERC-supported research.

Physics

26

Bow Waves, Halley'S Comet, Ion Distribution, Shock Waves, Energy Spectra, Giacobini-Zinner Comet, Hydrogen Ions, Oxygen Ions, Wave Propagation

Scientific paper

This paper compares calculated and measured energy spectra of implanted H(+) and O(+) ions on the assumption that the pickup geometry is quasi-parallel and about 1 percent of the waves generated by the cometary pickup process propagate backward (toward the comet). The model provides a good description of the implanted O(+) and H(+) energy distribution near the pickup energies. The thickness of the implanted ion velocity distribution shells was nearly constant between 2.5 and 1.2 million km (just outside the shock) along the inbound Giotto trajectory. The explanation is that the velocity diffusion coefficient and characteristic diffusion time vary approximately as 1/r and r, respectively, and therefore their product (which determines the velocity shell thickness) remains nearly constant.

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