Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..391s&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 391-397 (SEE N88-21884 14-91)
Physics
3
Comet Tails, Cosmic Dust, Halley'S Comet, Particle Mass, Clusters, Comet Nuclei, Particle Production, Vega Project
Scientific paper
Measurements from the Dust Counter and Mass Analyzer (DUCMA) instruments on VEGA-1 and -2 revealed unexpected fluxes of low mass (up to 10 to the minus 13th power g) dust particles at very great distances from the nucleus (300,000 to 600,000 km). These particles are detected in clusters (10 sec duration), preceded and followed by relatively long time intervals during which no dust is detected. This cluster phenomenon also occurs inside the envelope boundaries. Clusters of low mass particles are intermixed with the overall dust distribution throughout the coma. The clusters account for many of the short-term small-scale intensity enhancements previously ascribed to microjets in the coma. The origin of these clusters appears to be emission from the nucleus of large conglomerates which disintegrate in the coma to yield clusters of discrete, small particles continuing outward to the distant coma.
Ksanfomality Leonid V.
Rabinowitz David
Sagdeev Roal'd. Z.
Simpson André J.
Tuzzolino Anthony J.
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