Comparison of picked-up protons and water group ions upstream of Comet Halley's bow shock

Details Comparison of picked-up protons and water group ions upstream of Comet Halley's bow shock Comparison of picked-up protons and water group ions upstream of Comet Halley's bow shock

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9518745n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Nov. 1, 1990, p. 18745-18753. Research supported by the Royal Society

Physics

26

Bow Waves, Halley'S Comet, Molecular Ions, Protons, Shock Waves, Ion Density (Concentration), Mass Spectroscopy, Pitch (Inclination), Velocity Distribution

Scientific paper

The similarities and differences between the picked-up cometary protons and water-group (WG) ions upstream of the bow shock of Comet Halley are examined using measurements obtained by the ion mass spectrometer and plasma analyzer experiments on board Giotto. It was found that the dependencies of the pitch angle and the energy diffusion rates of the cometary protons and WG ions on the ion densities and on the angle alpha between the interplanetary field and the solar wind velocity vector were very different. This finding could not be explained in terms of presently available theories and models.

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