Three component plasma electron distribution in the intermediate ionized coma of Comet Giacobini-Zinner

Details Three component plasma electron distribution in the intermediate ionized coma of Comet Giacobini-Zinner Three component plasma electron distribution in the intermediate ionized coma of Comet Giacobini-Zinner

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..401z&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, April 1986, p. 401-404. DOE-sponsored research.

Physics

11

Coma, Comet Heads, Electron Distribution, Giacobini-Zinner Comet, Space Plasmas, Electron Energy, Flyby Missions, Nonuniform Plasmas, Plasma Diagnostics, Comets, Giacobini-Zinner, Plasma, Electrons, Distribution, Comae, Flow, Ionization, Ice Mission, Temperature, Density, Velocity, Photoionization, Turbulence, Source, Comet Nuclei, Cooling, Solar Wind, Collisions, Distance, Neutral Particles, Water, Comparisons, Energy, Composition, Electrostatic Properties, Spacecraft Observations

Scientific paper

The observation of three distinct components of the electron distribution function measured in the intermediate ionized coma (IIC) and plasma tail of Comet Giacobini-Zinner is reported. It is believed that the cold component represents electrons produced close to the comet nucleus by ionization of cometary matter and subsequent cooling by Coulomb collisions. The second component also appears to be composed of electrons produced by photoionization of cometary neutrals, but sufficiently far from the nucleus that the distributions are largely unaffected by Coulomb interactions. The hot component is probably a population of electrons originating in the solar wind. Throughout the IIC, the electrostatic potential of the spacecraft was very low (less than 0.8 eV), implying that ICE generated very little impact-produced plasma during its passage.

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