Electron component of the plasma around Halley's Comet measured by the electrostatic electron analyzer of PLASMAG-1 onboard Vega-2

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Electron Spectroscopy, Electrostatic Probes, Halley'S Comet, Space Plasmas, Vega Project, Bow Waves, Electron Energy, Giotto Mission, Plasma Temperature

Scientific paper

Measurements of the electron spectra obtained by VEGA-2 in the vicinity of comet Halley are presented. It is shown that the temperature of thermal electrons decreases from about 4×105K shortly behind the bow shock to about 2×105K at the cometopause. Inside the cometopause a fast increase in the flux of energetic electrons of about 1 keV is observed. Various possibilities for the differences in the electron spectra measured by VEGA-2 and by Giotto are discussed.

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