Quasi-periodic variations of cometary ion fluxes at large distances from Comet Halley

Details Quasi-periodic variations of cometary ion fluxes at large distances from Comet Halley Quasi-periodic variations of cometary ion fluxes at large distances from Comet Halley

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..115r&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 7, April 1989, p. 115-119.

Physics

1

Cometary Atmospheres, Halley'S Comet, Ion Density (Concentration), Particle Flux Density, Comet Nuclei, Giotto Mission, Neutral Atoms, Vega Project, Comets, Halley, Ions, Flux, Periodicity, Upstream, Distance, Models, Spacecraft Observations, Parameters, Comparisons, Neutral Particles, Velocity, Hydrogen, Oxygen, Photodissociation, Vega 1 Mission, Diagrams, Giotto Mission, Tunde-M Instrument, Epona Instrument, Calculations

Scientific paper

Large variations, with a period of about 4 h, in the energetic ion fluxes have been observed far upstream (between 2 and 10 million kilometers) of Comet Halley on both the Vega-1 and Giotto spacecraft. The cometocentric distances of the occurrences have been fitted to a simple model of expanding shells of neutral particles, the production of which is modulated by the spin of the comet nucleus, and excellent agreement between the two spacecraft has been achieved. An expansion speed for the neutrals of 6.18 + or - 0.14 km/s is derived. Possible candidates for the neutrals are hydrogen atoms, created by the photo-dissociation of OH with a speed of 8 km/s, or oxygen atoms, produced from the photodissociation of CO2 with a speed of 6.5 km/s.

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