Other
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92...39c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 39-46. SNSF-supported research.
Other
18
Giacobini-Zinner Comet, Ion Density (Concentration), Satellite Observation, Solar Wind, Abundance, International Sun Earth Explorer 3, Plasma Composition, Satellite-Borne Instruments, Comets, Giacobini-Zinner, Ions, Composition, Solar Wind, Upstream, Ici, Ice Mission, International Cometary Explorer, Ion Composition Instrument, Spacecraft Observations, Kinetics, Temperature, Density, Velocity, Shock, Distribution, Abundance, Comparisons, Spectroscopy, Origin, Sputtering, Photoionization, Helium, Electrons,
Scientific paper
The observations by the ion composition instrument (ICI) on the ICE spacecraft made during the encounter with comet P/Giacobini-Zinner (Ogilvie et al., 1986) are discussed in detail. Solar wind He-4(2+) kinetic temperatures, densities, and velocities before, during, and after the encounter are presented. These data combined with He-4(2+) velocity distributions provide evidence for the existence of a thick diffuse shock. Relative abundances of water group ions and CO(+) are derived along with an estimate of the abundance of an ion with M/Q = 24 + or - 1 amu/e. The ICI data are compared with electron data from two other experiments (Bame et al., 1986; Meyer-Vernet et al., 1986) and found to be in reasonable agreement in the region outside the tail. Spectroscopic data for several neutral and ionic species are compared with the ICI results for the water group ions and CO(+). The spectroscopic data are also used to eliminate Mg(+) and CN(+) as candidates for the M/Q = 24 peak. The two most likely candidates are C2(+) and Na(+), but neither photoionization of parent neutrals nor sputtering from dust grains is sufficient to explain the observed abundance relative to H2O(+).
A'Hearn Michael F.
Bochsler Peter
Coplan Michael A.
Geiss Johannes
Ogilvie Keith. W.
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