Plasma fluctuations and large-scale mixing near Comet Giacobini-Zinner

Details Plasma fluctuations and large-scale mixing near Comet Giacobini-Zinner Plasma fluctuations and large-scale mixing near Comet Giacobini-Zinner

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..271b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, March 1986, p. 271-274. DOE-NASA-sponsored research.

Physics

22

Comet Nuclei, Giacobini-Zinner Comet, Magnetohydrodynamic Flow, Plasma Density, Plasma Temperature, Space Plasmas, Electron Density (Concentration), Electron Energy, Electron Plasma, Low Pass Filters, Spectrum Analysis, Comets, Giacobini-Zinner, Ice Mission, Spacecraft Observations, Plasma, Fluctuations, Mixing, Plasma Electron Experiment, Spectrometry, Spectra, Diagrams, Velocity, Density, Temperature, Amplitude, Flow, Hypotheses

Scientific paper

The relationship among plasma densities, flow speeds and directions, and temperatures, at distances within about 100,000 km of Comet Giacobini-Zinner's nucleus, are presently examined in view of lowpass-filtered data from the International Cometary Explorer's electron spectrometer. While the largest amplitude density spikes often have more significant flow changes associated with them, a consistent pattern is not found. Power spectral analyses in and near the sheath/transition regions show that density fluctuation levels are enhanced at all detectable frequencies, consistent with strong density fluctuations on all time scales. Such mechanisms as the amplification of convected ion pickup waves and cometary rays for producing the large plasma variations are discussed. It is suggested that the Rayleigh-Taylor effect-driven mixing mechanism at a mass-loading boundary abut 100,000 km from the nucleus may be operative.

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