In situ gas and ion measurements at comet Halley

Details In situ gas and ion measurements at comet Halley In situ gas and ion measurements at comet Halley

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..326k&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 326-329.

Computer Science

313

Atmospheric Composition, Cometary Atmospheres, Gas Spectroscopy, Halley'S Comet, Ion Density (Concentration), Mass Spectroscopy, Abundance, Comet Nuclei, Giotto Mission, Ion Temperature, Neutral Gases, Water Vapor, Comets, Halley, Spacecraft Observations, Mission Description, Experiments, Giotto, Gases, Ions, Nms, Neutral Mass Spectrometer, Abundance, Comae, Chemistry, Elements, Isotopes, Composition, Energy, Water Vapor, Water, Density, Velocity, Carbon Dioxide, Ammonia, Methane, Comparisons, Temperature,

Scientific paper

The neutral mass spectrometer experiment carried by the Giotto spacecraft was designed to determine the abundances and the chemical, elemental and isotopic composition of the gases and low-energy ions in the coma of comet Halley. Its first results show the predominance of water vapour with an H2O density of 4.7x107molecules cm-3 at 1,000 km. Limits on the abundances of CO2, NH3 and CH4 relative to H2O are given. The water-group ions H3O+, H2O+ and OH+ have been unambiguously identified, along with the ions 12C+, 12CH+, 16O+, Na+, 12C2+, 32S+, 34S+ and 56Fe+.

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