Plasma waves in Halley's inner coma as measured by the APV-N experiment during VEGA mission

Details Plasma waves in Halley's inner coma as measured by the APV-N experiment during VEGA mission Plasma waves in Halley's inner coma as measured by the APV-N experiment during VEGA mission

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a..89o&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 89-92 (SEE N87-2

Computer Science

Comet Nuclei, Electric Fields, Halley'S Comet, Plasma Spectra, Plasma Waves, Cometary Atmospheres, Flux Density, Infrared Spectroscopy, Plasma Diagnostics, Spectrum Analysis, Vega Project

Scientific paper

Measurements of electric field spectral density in 10 Hz to 1 kHz frequency range in Halley's inner coma are discussed. At distances between 600,000 and 300,000 km from the nucleus the ambient plasma waves are strongly disturbed by interference with the signals produced by gas leakage from the infrared spectrometer. At smaller distances the wave amplitudes exceed the interference level enabling the continuous measuerement of the increasing wave activity. Significant changes of the plasma wave spectra take place in the heavy ion mantle and in the cometary plasma region. Three characteristic peaks: at 7 to 23 Hz, 170 to 430 Hz, and 950 Hz, are identified in the spectra obtained near the closet approach. There are considerable differences between the APV-N measurements aboard Vega 1 and Vega 2. Comparison with the APV-V results suggests that plasma wave amplitude exceeded the dynamic range of APV-N aboard Vega 2.

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