Derivation of heavy (10-210 AMU) ion composition and flow parameters for the Giotto PICCA instrument

Computer Science

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Halley'S Comet, Heavy Ions, Ion Probes, Magnetohydrodynamic Flow, Parameter Identification, Plasma Composition, Electron Energy, Electrostatic Probes, Flow Velocity, Giotto Mission, Plasma Temperature

Scientific paper

The heavy ion analyzer RPA2-PICCA is designed to identify the composition and distribution of heavy thermal positive ions in the coma of comet Halley. The instrument is an electrostatic analyzer which takes advantage of the large relative flyby velocity and the fact that the ions in the inner coma should be cold and predominantly singly charged. A method of deconvolving these E/Q measurements to yield ion mass composition, temperature and flow velocity is presented. These measurements are used to investigate the dynamic behaviour of the ions and variations in mass composition as a function of cometary distance.

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