Observations of energetic ions from comet Giacobini-Zinner

Details Observations of energetic ions from comet Giacobini-Zinner Observations of energetic ions from comet Giacobini-Zinner

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...232..361h&link_type=abstract

Science (ISSN 0036-8075), vol. 232, April 18, 1986, p. 361-365.

Computer Science

88

Energetic Particles, Giacobini-Zinner Comet, Heavy Ions, Comet Tails, Flux (Rate), Mass Spectroscopy, Solar Wind, Comets, Giacobini-Zinner, Ice Mission, Mission Description, Comet Tails, Spacecraft Observations, Comae, Solar Wind, Interaction, Atmosphere, Ions, Energetic Particle Anisotropy Spectrometer, Flux, Ionization, Acceleration, Energy, Distribution, Ionosphere, Epas

Scientific paper

During the encounter with comet Giacobini-Zinner, the energetic particle anisotropy spectrometer on the International Cometary Explorer spacecraft observed large fluxes of energetic ions, believed to result principally from ionization of the cometary atmosphere followed by pickup and acceleration by the ambient flow of the solar wind. These heavy cometary ions were observed from approximately 1 day before closest approach to about 2.5 days afterward. Three regimes of differing ion chracteristics have been identified. An outer region with a scale of one-million kilometers contains variable fluxes of antisolar-streaming pickup ions in the undisturbed solar wind. In the middle region, of 100,000 kilometers, fluxes have less large-scale variability and broader angular and energy distributions. This region is separated from the outer zone by a sharp transition. The inner region has a scale of 10,000 kilometers and is chracterized by reduced fluxes and complex angular distributions.

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