Computer Science
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a..93g&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 93-97 (SEE N87-2
Computer Science
3
Halley'S Comet, Ion Density (Concentration), Plasma Composition, Plasma Diagnostics, Space Plasmas, Abundance, Electrostatic Probes, Plasma Chemistry, Vega Project
Scientific paper
Based on the measurements of the CRA electrostatic analyzer of the PLASMAG-1 instrument, which was oriented along the spacecraft-comet relative velocity direction, observations of the cometopause, of quasi-periodic features occurring in the ion intensity inside the cometopause, of the mass composition of cometary ions between 1 and 100 amu in the cold and slowly moving plasma, and of the radial dependence of the density of certain groups of cometary ions are presented. The ion measurements are corrected for the nonlinear effects in the channeltron counting rates close to the encounter. At a few tens of thousands of km from the nucleus, 70% to 80% of the ion content belongs to the H2O group, 15% to 20% stems from the CO/CO2 group, and 2% to 5% has a mass of 44 (CO2+). The ratios are in reasonable agreement with those measured by the PICCA and by the IMS instruments on board Giotto.
Apáthy I.
Gombosi Tamas I.
Gringauz K. I.
Remizov A. P.
Richter Arne K.
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