Physics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991prir........89l&link_type=abstract
Priroda (ISSN 0032-874X), March 1991, p. 89-96. In Russian.
Physics
Interplanetary Dust, Meteoritic Composition, Meteoroids, Organic Materials, Polymers, Chemical Composition, Fragmentation, Iron Meteorites, Physical Properties, Stony Meteorites
Scientific paper
Major research on meteors and cosmic dust is reviewed and hypotheses concerning their chemical and physical characteristics are proposed. It is suggested that fragmentation (not vaporization) is the main process that causes ablation of stony and iron meteoroids. Statistical analysis of meteor catalogs revealed the following distribution of meteoroids in interplanetory space: iron and stony-iron meteoroids, 4 percent; CIII and CII carbonaceous chondrites, 20 percent; CI carbonaceous chondrites, 32 percent; CO carbonaceous chondrites and 'dust clumps', 44 percent. Draconids-type meteoroids are characterized, and it is suggested that in terms of chemical composition they are similar to CHON-particles found in the Comet Halley cluster. Meteoroids of the Draconids cluster consist primarily of organic compounds. Analysis of meteor and bolide altitudes using photographic/TV catalogs showed that from 2 to 10 percent of these objects are located at anomalously high altitudes and consequently about half of all meteoroids in interplanetary space consist of high molecular organic polymers. The influx of meteor matter is estimated at 100 ton per day excluding the mass of organic dust. Minicomets bring into the atmosphere about 3-million tons of matter, and 40,000 to 500,000 tons of this amount might be due to high molecular organic polymers.
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