Negative ions in comets

Details Negative ions in comets Negative ions in comets

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981m%26p....24..157w&link_type=abstract

Moon and the Planets, vol. 24, Apr. 1981, p. 157-173.

Physics

7

Comets, Cosmic Plasma, Comet Nuclei, Electron Attachment, Hydroxyl Radicals, Particle Collisions, Photodissociation, Solar Protons, Solar Wind

Scientific paper

Negative ion sources in comets are identified and cometary plasma effects caused by negative ions are examined. The primary negative ion sources are shown to be: (1) for the inner coma - photodissociation of HCN, electron attachment of OH, and collision with alkalis; (2) in the vicinity of the nucleus - interplanetary dust collisions with the nucleus; and (3) for both the contaminated solar wind region and sporadic discharges in the nonhomogeneous inner coma plasma - dissociative electron attachment and charge inversion during keV positive ion scattering by cometary dust. Negative ion abundance for Halley's Comet has been estimated to be 10 to the -6th - 10 to the -10th of electron densities.

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