Computer Science
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993p%26ss...41..609o&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 41, no. 8, p. 609-617
Computer Science
8
Electric Current, Electric Fields, Electric Potential, Flyby Missions, Halley'S Comet, Interplanetary Dust, Plasma Clouds, Space Plasmas, Flux (Rate), Particle Density (Concentration), Particle Mass, Spaceborne Experiments, Vega Project
Scientific paper
The quasistatic electric field records made in Halley's coma by the APV-V experiment represented a superposition of the overall negative variation with a number of positive spikes. A correlation has been found between the overall variation and the count rates of dust particles in the mass range 10-11 - 10-8 g. For interpretation purposes the impact-induced plasma cloud radius has been specifically defined. Owing to the asymmetry of the double-probe antenna with respect to the impact direction, the particles producing plasma clouds with radii greater than several meters induced impulsive negative potentials of different magnitudes on the two probes, thereby generating an apparent electric field. In the inner coma, the electron emission generated by impacts of cometary gas molecules maintained the senstivity of the antenna to dust impacts, but implied that the lower mass limit of particles responsible for the apparent electric field varied proportionally with the secondary electron current. The linear dependence of the quasistatic signal on the particle flux breaks down for high fluxes; hence, the positive spikes are interpreted as manifestations of small-scale, dense clouds of dust. The present study has shown that a long double-probe antenna can be used as a large dust particle detector, whose target area is comparable to the spacecraft projected area.
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