A CCD observation of the water ion distribution in the coma of comet P/Halley near the Giotto encounter

Details A CCD observation of the water ion distribution in the coma of comet P/Halley near the Giotto encounter A CCD observation of the water ion distribution in the coma of comet P/Halley near the Giotto encounter

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206..129i&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 1, Nov. 1988, p. 129-132.

Astronomy and Astrophysics

Astrophysics

8

Cometary Atmospheres, Density Distribution, Giotto Mission, Halley'S Comet, Space Density, Water, Astronomical Spectroscopy, Comet Nuclei, Molecular Ions, Outgassing, Solar Wind

Scientific paper

An analysis of the H2O+ ion emission feature at 6198 Å in the central coma of comet P/Halley obtained by long-slit CCD spectroscopy 13 h after the Giotto encounter indicates the formation of a density maximum in the concentration of H2O+ ions at r ≡ 2×104km from the comet centre. This ion pile up feature is similar to the plasma structures observed by in-situ measurements on Vega and Giotto. The present result thus suggests that such ion pile up effect is most likely of a quasi-stationary nature in this particular time interval.

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