Dust observations of Comet Halley by the plasma-wave analyser

Details Dust observations of Comet Halley by the plasma-wave analyser Dust observations of Comet Halley by the plasma-wave analyser

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.409t&link_type=abstract

In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 409-414 (SEE N87-26714

Physics

Cosmic Dust, Halley'S Comet, Plasma Probes, Plasma Waves, Vega Project, Electric Fields, Electromagnetic Noise, Field Strength, Particle Laden Jets, Plasma Diagnostics

Scientific paper

This paper reports on the electric field observations made with the high-frequency plasma-wave analyser, APV-V, during the Vega spacecraft encounters with comet Halley on March 6 and 9, 1986. Electric fields are measured in the bandwidth 0 - 300 kHz with an antenna made of two spheres separated by a distance of 11 m. As the nucleus is approached, the average amplitude and bandwidth of the ac electric field increase dramatically; at frequencies above 1 kHz, the power law index of the electric field spectrum is about -3.4 (E2 ≡ f-3.4) which is typical of random electric pulses induced by dust particles. A strong correlation is found between spikes in the quasi-static electric field and small-scale variations in dust count rates for masses less than 10-12g. The authors have also identified several large scale gradients in the ac electric field intensity within 140,000 km from the nucleus which are believed to be associated with jets of light dust particles.

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