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

The Vega-1 and Vega-2 spacecraft explored the comet P/Halley's environment in March 1986. Several plasma boundaries were crossed, which result from interaction between solar wind and the comet. Here we report on the observations performed by the plasma-wave analyser APV-V in the vicinity of some of these boundaries. Electric-field spectral measurements are stressed and the interpretations of the data collected by other experiments in these regions are reviewed