The interaction of heavy ions from Comet P/Giacobini-Zinner with the solar wind

Details The interaction of heavy ions from Comet P/Giacobini-Zinner with the solar wind The interaction of heavy ions from Comet P/Giacobini-Zinner with the solar wind

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..411s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, April 1986, p. 411-414.

Physics

31

Comet Tails, Giacobini-Zinner Comet, Heavy Ions, Particle Interactions, Solar Wind, Asymmetry, Energy Spectra, Interplanetary Magnetic Fields, Comets, Giacobini-Zinner, Heavy Ions, Interaction, Solar Wind, Flux, Ice Mission, Distribution, Spectra, Energy, Composition, Distance, Water, Symmetry, Velocity, Time Scale, Magnetic Fields, Comparisons, Energetic Particle Anisotropy Spectrometer, Epas, Spacecraft Observations, Theoretical Studies

Scientific paper

The encounter between the ICE spacecraft and Comet P/Giacobini-Zinner was characterized in the solar wind by intense fluxes of heavy ions, measurable over a region 6 x 10 to the 6th km in extent. The ions are observed with highly anisotropic angular distributions, steep energy spectra, and a change in the energy spectrum at around 80 keV, consistent with a composition predominantly of the water group. Flux versus time profiles follow a general fall off with increasing distance from the comet, but with a marked inbound/outbound asymmetry. This asymmetry is due to the higher solar wind velocity on the outbound pass, giving rise to an increased energy gain of the pick-up ions. The flux versus time profiles are strongly modulated by the rapid changes in the direction of interplanetary magnetic field. Correlated observations of energetic ions, the interplanetary magnetic field and the solar wind are presented, and these observations are compared with theoretical predictions of the ion pick-up process.

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