Velocity space diffusion of pickup ions from the water group at Comet Halley

Details Velocity space diffusion of pickup ions from the water group at Comet Halley Velocity space diffusion of pickup ions from the water group at Comet Halley

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.9983c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Aug. 1, 1989, p. 9983-9993. Research supported by the Swedish Board f

Physics

81

Giotto Mission, Halley'S Comet, Ionic Diffusion, Pitch (Inclination), Plasma Turbulence, Satellite-Borne Instruments, Solar Wind, Water

Scientific paper

The diffusion in velocity space of cometary ions was studied using the distributions of ions measured by the implanted ion spectrometer in Giotto during the inbound pass. The measurements were transformed into a frame comoving with the solar wind and oriented with the magnetic field. The observations show the evolution of the pitch angle distribution in the solar wind turbulence to form a shell from the initial ring. Diffusion in energy takes place simultaneously but on a longer time scale. Comparison with theory is inhibited by the lack of a suitable spatial model, but the simple arguments that can be made indicate that pitch angle diffusion and the process of parallel pickup take place more slowly than theory suggests.

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