Identification of boundaries in the cometary environment from ac electric field measurements
Electric fields are measured with the APV-V experiment in the frequency range 8 Hz-300 kHz. The field amplitude increases significantly, first at a distance of 2 105 km, then at distances of 1.2–1.5 105 km, and 5–7 104 km from the nucleus. These phenomena have been observed both on Vega-1 and Vega-2. The electric field measurements are compared with data obtained from dust and plasma experiments; possible mechanisms responsible for the existence of these boundaries are discussed.
Key wordscomet Halley Vega electric field boundaries cometopause plasma
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