Physics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36.1429r&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 36, Dec. 1988, p. 1429-1450.
Physics
8
Energetic Particles, Giacobini-Zinner Comet, Ion Motion, Solar Wind, Bow Waves, Flux Quantization, Plasma Dynamics, Satellite Observation, Space Plasmas
Scientific paper
Data from the ICE spacecraft are used to study the properties of energetic (65-95 keV) cometary water-group ions in the extended solar wind pick-up region surrounding comet Giacobini-Zinner. In the outer part of the region extending from cometocentric distances of several hundred thousand to a few million km, large modulations of the ion flux are observed. It is shown that waves which are excited by the unstable ring-beam pick-up ion velocity distributions do result in significant scattering of the ions in this region, both in pitch angle and in energy. These have insufficient amplitude to scatter the ions into near isotropy in the solar wind frame. It is found that the evolution of the ion properties is qualitatively consistent with expectations based on quasi-linear diffusion of the ions by the magnetosonic waves observed during the encounter.
Cowley Stan W. H.
Daly Patrick W.
Hynds R. J.
Richardson Ian G.
Sanderson T. R.
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