Plasma boundaries at Comet Halley

Details Plasma boundaries at Comet Halley Plasma boundaries at Comet Halley

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..243s&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, April 1990, p. 243-250.

Computer Science

Sound

20

Cosmic Plasma, Electromagnetic Coupling, Halley'S Comet, Magnetohydrodynamic Flow, Solar Protons, Solar Wind, Bow Waves, Comet Nuclei, Electron Plasma, Giacobini-Zinner Comet, Comets, Halley, Plasma, Boundaries, Flow, Electrons, Solar Wind, Protons, Ions, Resonance, Velocity, Distance, Comet Nuclei, Models, Bow Shock, Cometopause, Comparisons, Spacecraft Observations, Waves, Calculations, Diagrams, Parameters, Thermal Effects, Pressure, Shock, Pickup, Mass Loading

Scientific paper

A cold multifluid model of solar wind-comet interaction is extended by including thermal pressure effects of the picked-up cometary ions. The inclusion of hot cometary ions leads to an additional resonance at the point where the flow velocity becomes equal to the ion sound velocity. For comet Halley conditions, the resonance point, which marks the transition from a stationary to a nonstationary flow regime, is located at a distance of about one million kilometers from the nucleus; the nonstationary region has an extension of about 0.3 million kilometers. Another nonstationary region is shown to begin near the point where the flow velocity becomes equal to the proton Alfven velocity. The corresponding plasma boundary is thought to be the cometopause. The results of the improved multifluid model are in good agreement with the Vega/Giotto plasma measurements.

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