Spatial distribution of H2O(+) in Comet P/Halley

Details Spatial distribution of H2O(+) in Comet P/Halley Spatial distribution of H2O(+) in Comet P/Halley

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990icar...86..152d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 86, July 1990, p. 152-171.

Physics

18

Halley'S Comet, Positive Ions, Spatial Distribution, Water Vapor, Solar Wind, Spectrum Analysis, Vega Project, Comets, Halley, Water, Distribution, Ions, Spectroscopy, Procedure, Analysis, Density, Comparisons, Production Rate, Parameters, Velocity, Earth-Based Observations, Water Vapor, Fluorescence, Morphology, Flow, Diagrams, Collisions, Distance, Radius, Acceleration, Calculations

Scientific paper

Comet Halley spectroscopic and imaging data near the time of the Vega 1 encounter in March 1986 have been analyzed for H2O(+) distribution and near-nucleus ion physics, using a data-reduction procedure encompassing flat fielding, sky removal, continuum subtraction, contamination correction, absolute flux calibration, and conversion to ion-column densities. A 25,000 km-radius collision zone within which collisions dominate the solar wind's sweeping effect is verified. A production rate of H2O(+) ions is calculated on the basis of the average velocity and column density integral across the tail. An analysis of the tailward ion flow indicates constant acceleration beyond 130,000 km from the nucleus.

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