Physical parameters for hot and cold electron populations in Comet Giacobini-Zinner with the ICE radio experiment

Details Physical parameters for hot and cold electron populations in Comet Giacobini-Zinner with the ICE radio experiment Physical parameters for hot and cold electron populations in Comet Giacobini-Zinner with the ICE radio experiment

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..279m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, March 1986, p. 279-282.

Physics

22

Electron Density (Concentration), Giacobini-Zinner Comet, Radio Receivers, Spectroscopy, Thermal Noise, Thermal Plasmas, Electron Distribution, Electron Energy, Noise Spectra, Plasma Sheaths, Comets, Giacobini-Zinner, Ice Mission, Spacecraft Observations, Electrons, Paramters, Plasma, Distribution, Spectroscopy, Temperature, Density, Symmetry, Shape, Pressure, Plasma Sheet

Scientific paper

Thermal plasma noise spectroscopy using the ICE radio receiver yielded the parameters of the two Maxwellian populations approximating the comet plasma electron distribution. Within 150,000 km around closest approach, three regions are observed: The inner one coincides with the low magnetic field region or plasma sheet; over 1200 km the density is nearly constant at 650 per cu cm; the overall profile, 5000 km wide, is asymmetrical and shows a narrow spike on each side of the maximum; the temperature is 16,000 K. From 9000 to 20,000 km from the nucleus (this is the second region), the density decreases as R-squared. The distribution is slightly asymmetrical, the density higher on the south side. Further away (this is the third region), the density and temperature fluctuate widely around about solar wind values. The hot electron pressure is much smaller than that of the cold electrons except near the edges of the plasma sheet where heating processes probably occur.

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