Fine structure of the near-cometary bow shock from plasma wave measurements. (APV-N-experiments)

Details Fine structure of the near-cometary bow shock from plasma wave measurements. (APV-N-experiments) Fine structure of the near-cometary bow shock from plasma wave measurements. (APV-N-experiments)

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.255k&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 255-258 (SEE N87

Computer Science

Bow Waves, Electric Fields, Fine Structure, Halley'S Comet, Plasma Waves, Shock Waves, Magnetohydrodynamic Waves, Plasma Diagnostics, Plasma Oscillations, Shock Fronts, Vega Project, Wave Generation

Scientific paper

The structure of plasma waves in the near-cometary shock region was studied. Data on fluctuations of the electric field and the plasma flow ion component in the frequency range 1 to 1000 Hz with a time resolution of 12 sec were used. Characteristic spectra measured 1 million km from the comet indicate that Vega-1 crossed the quasi-perpendicular bow shock (BS) and Vega-2 the quasi-parallel shock. Precursors of the BS were observed in the frequency range 1.5 to 8.5 Hz with a modulation frequency of 20 min 6 to 8 hr before the BS crossing. At the shock front the level of magnetosonic oscillations increases near a low-hybrid frequency (LH) as well as in the intermediate frequency range between LH and electron-cyclotron frequencies. At the quasi-perpendicular BS front there is a drastic increase in the intensity within 1 to 450 Hz; at the quasi-parallel BS front, within 1 to 85 Hz. Mechanisms for generation of the waves are discussed.

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