Bulk properties and velocity distributions of water group ions at Comet Halley - Giotto measurements

Details Bulk properties and velocity distributions of water group ions at Comet Halley - Giotto measurements Bulk properties and velocity distributions of water group ions at Comet Halley - Giotto measurements

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510249c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10249-10260. Research supported by SERC, DOE, Swedis

Physics

6

Giotto Mission, Halley'S Comet, Heavy Ions, Ion Scattering, Solar Wind, Velocity Distribution, Ion Density (Concentration), Mass Spectrometers, Pitch (Inclination), Comets, Halley, Spacecraft Observations, Giotto Mission, Velocity, Water, Distribution, Heavy Ions, Upstream, Pickup, Iis Instrument, Diffusion, Energy, Comparisons, Scattering, Diagrams, Density, Calculations, Distance

Scientific paper

In the region upstream of Comet Halley, pickup heavy ions of cometary origin were directly observed by the implanted ion spectrometer on Giotto. Diffusion of this population in pitch angle and in energy, during the approach to the comet and on the outbound leg is discussed. The two data sets are compared and qualitative ideas on scattering timescales are inferred. In addition the bulk parameters of these distributions have been computed and a comparison of the observed speed in the solar wind frame and the observed density with expectations is presented. Pitch angle scattering occurs more slowly than expected with filled shells appearing at 2,500,000 km, and significant energy diffusion does not occur until the bow shock region. Also the shell distributions downstream of the shock flow at the bispherical bulk speed (related to the Alfven speed) along the magnetic field with respect to the solar wind in accordance with conservation of energy between the pickup ions and the wave turbulence.

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