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The origin of low mass particles within and beyond the dust coma envelopes of Comet HalleyMeasurements 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.
Document ID
19880012554
Document Type
Conference Paper
Authors
Simpson, J. A. (Chicago Univ. IL., United States)
Rabinowitz, D. (Chicago Univ. IL., United States)
Tuzzolino, A. J. (Chicago Univ. IL., United States)
Ksanfomality, L. V. (Academy of Sciences (USSR) Moscow., United States)
Sagdeev, R. Z. (Academy of Sciences USSR, Moscow , United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1987
Publication Information
Publication: ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NASW-3959
Distribution Limits
Public
Copyright
Other