The pick-up of cometary protons by the solar wind

Physics

Scientific paper

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Halley'S Comet, Plasma-Particle Interactions, Proton Flux Density, Proton Scattering, Solar Wind, Bow Waves, Cometary Atmospheres, Giotto Mission, High Energy Interactions, Particle Trajectories, Photoionization, Shock Waves, Solar Protons

Scientific paper

The HERS detector of the Ion Mass Spectrometer on the Giotto spacecraft measured the 3-dimensional distribution of picked-up cometary protons over a distance of 6 million km upstream of the bow shock. The protons were observed to be elastically scattered out of their original cycloidal trajectories such that they were nonuniformly distributed over a spherical shell in velocity space. The shell thickness increased as the bow shock was approached. Inside the shock, the cometary protons were difficult to distinguish from the heated solar wind protons.

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