Electric-field measurements in Comet P/Halley's environment by the high-frequency plasma-wave analyser

Details Electric-field measurements in Comet P/Halley's environment by the high-frequency plasma-wave analyser Electric-field measurements in Comet P/Halley's environment by the high-frequency plasma-wave analyser

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7..331t&link_type=abstract

Annales Geophysicae (ISSN 0980-8752), vol. 7, Aug. 1989, p. 331-340.

Astronomy and Astrophysics

Astronomy

2

Electric Fields, Electrical Measurement, Halley'S Comet, Plasma Diagnostics, Spaceborne Astronomy, Comet Heads, Plasma Interactions, Solar Wind, Space Plasmas, Vega Project, Comets, Halley, Electric Fields, Spacecraft Observations, Vega Missions, Plasma Waves, Boundaries, Apv-V Instrument, Pickup, Bow Shock, Spectra, Cometopause, Dust, Impacts, Comae, Analysis

Scientific paper

The Vega-1 and Vega-2 spacecraft explored Comet P/Halley's environment in March 1986. Several plasma boundaries were crossed which result from interaction between the solar wind and the comet. Here, observations performed by the plasma-wave analyzer APV-V in the vicinity of some of these boundaries the pick-up region in front of the bow shock, the cometopause, and a region probed by Vega-2 between 0711 and 0714 UT on March 9, 1986 are reported on. Electric-field spectral measurements are stressed, and interpretations of the data collected by other experiments in these regions are reviewed. The bow shock does not cause any detectable feature in the APV-V electric-field data. A spectral analysis of the electric signal recorded in the 8-14 Hz filter channel near the cometopause reveals clear oscillations with a period lying between 20 and 60 s. The event observed by Vega-2 in the inner coma, at a distance of about 40000 km from the nucleus, is analyzed in detail. It is concluded that the data are strongly influenced by dust impacts.

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