Plasma observation by Suisei of solar-wind interaction with comet Halley

Physics

Scientific paper

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Comet Nuclei, Halley'S Comet, Ion Motion, Magnetohydrodynamic Flow, Plasma Dynamics, Solar Wind, Bow Waves, Energetic Particles, Energy Spectra, Japanese Spacecraft, Shock Waves, Comets, Halley, Spacecraft Observations, Mission Description, Experiments, Suisei, Plasma, Solar Wind, Interaction, Flow, Ions, Turbulence, Esp, Energy Spectrum Of Particles, Structure, Spectra, Bow Wave, Mass Loading, Equipment, Procedure, Velocity, Distribution, Diagrams, Energy

Scientific paper

The Japanese spacecraft Suisei encountered comet Halley on March 6, 1986, passing through a strong interaction region where the solar wind flow was severely perturbed by pickup ions of cometary origin. Plasma observations point to the existence of a cometary ion assimilation process in the solar wind flow. Some 230,000 km from the cometary nucleus, shell structures in the velocity space of cometary protons and water-group ions were clearly observable. The abrupt change of the plasma parameter observed at 450,000 km from the nucleus is suggested to represent the bow wave crossing. Mass loading was observed at a distance of up to about 1 million km.

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