Small minded - The characterization of interplanetary dust by electron microscopy

Details Small minded - The characterization of interplanetary dust by electron microscopy Small minded - The characterization of interplanetary dust by electron microscopy

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..517p&link_type=abstract

Nature, vol. 294, Dec. 10, 1981, p. 517, 518.

Computer Science

1

Chondrites, Earth Atmosphere, Electron Microscopy, Interplanetary Dust, Meteoritic Composition, Neutron Activation Analysis, Comets, Electron Diffraction, Polycrystals, Cosmic Dust, Electron Microscopy, Characteristics, Particles, Grains, Brownlee Particles, Sampling Techniques, Samples, Extraterrestrial, Analysis, Techniques, Taxonomy, Composition, Elements, Abundance, Comparisons, Metamorphism, Oxidation, Classification

Scientific paper

The collection and analysis of Brownlee particles, interplanetary dust found in the atmosphere, are discussed. The particles are usually around 10 microns in diameter and have slowed to terminal velocity at altitudes near 100 km, having been heated to 550 C for not more than two seconds. Electron microscopy and neutron activation analysis have been employed, noting that the samples are collected by NASA from regions of concentration of one particle per 1000 cu cm. Chondritic compositions have been observed, although inter- and intra-grain abundance ratios do not display a distinct chondritic grouping. Single and polycrystal diffraction studies have identified magnetite, pyroxene, olivine, pyrohotite, taenite, and cohenite. The possibility that the dust particles are of cometary origin will be examined with data from the ESA Halley mission.

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