First in situ plasma and neutral gas measurements at comet Halley

Details First in situ plasma and neutral gas measurements at comet Halley First in situ plasma and neutral gas measurements at comet Halley

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..282g&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 282-285.

Computer Science

146

Cosmic Plasma, Halley'S Comet, Neutral Gases, Vega Project, Bow Waves, Cosmochemistry, Energy Spectra, Gas Density, Space Plasmas, Comets, Halley, Spacecraft Observations, Mission Description, Experiments, Plasmag, Cometary Plasma Spectrometer, Vega 1, Vega 2, Plasma, Gases, Distribution, Distance, Parameters, Comet Nuclei, Structure, Bow Shock, Chemistry, Composition, Mass Loading, Production Rate, Spectra, Energy

Scientific paper

The first in situ observations and a description of the large-scale behavior of comet Halley's plasma environment are presented. The changes of the plasma parameters and distributions as a function of distance from Halley's nucleus, the existence and structure of the cometary bow shock, the change in chemical composition of the heavily mass-loaded plasma as the comet is approached, and the neutral gas distribution along the spacecraft trajectory as detemined from the PLASMAG-1 experiment aboard Vega 1 and 2 are discussed. A discontinuity is observed between the solar wind-controlled cometosheath and heavy-ion mantle and the magnetized cometary plasma region. A total gas production rate of 1.3 x 10 to the 30th molecules/s is estimated from the measured neutral gas density distribution.

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