Electron impact ionization in the vicinity of comets

Details Electron impact ionization in the vicinity of comets Electron impact ionization in the vicinity of comets

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7341c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7341-7353.

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82

Cometary Atmospheres, Electron Impact, Gas Ionization, Molecular Ions, Plasma Interactions, Bow Waves, Cometary Magnetospheres, Computational Astrophysics, Extreme Ultraviolet Radiation, Magnetosheath, Neutral Particles, Shock Waves, Solar Wind, Comets, Electrons, Impacts, Ionization, Comae, Solar Wind, Interaction, Neutral Particles, Photoionization, Ultraviolet, Radiation, Distance, Distribution, Halley, Giacobini-Zinner, Spacecraft Observations, Water, Vega Missions, Ice Mission, Frequency, Magnetosheath

Scientific paper

The solar wind interacts very strongly with the extensive cometary coma, and the various interaction processes are initiated by the ionization of cometary neutrals. The main ionization mechanism far outside the cometary bow shock is photoionization by solar extreme ultraviolet radiation.Electron distributions measured in the vicinity of comets Halley and Giacobini-Zinner by instruments on the VEGA and ICE spacecraft, respectively, are used to calculate electron impact ionization frequencies. Ionization by electrons is of comparable importance to photoionization in the magnetosheaths of Comets Halley and Giacobini-Zinner. The ionization frequency in the inner part of the cometary plasma region of comet Halley is several times greater than the photoionization value. Tables of ionization frequencies as functions of electron temperature are presented for H2O, CO2, CO, O, N2, and H.

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