Computer Science
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..111..227l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 111, no. 1, p. 227-236
Computer Science
35
Interplanetary Dust, Micrometeoroids, Particle Size Distribution, Stratosphere, Chondrites, Density Distribution, Particle Mass, Scanning Electron Microscopy, Transmission Electron Microscopy, Volume, X Ray Analysis
Scientific paper
We have measured the densities of roughly 150 5- to 15-microns interplanetary dust particles (IDPs) harvested in the stratosphere. Care was taken to minimize selection bias in the sample population. Masses were determined using an absolute X-ray analysis technique with a transmission electron microscope, and volumes were found using scanning electron microscope imagery. Unmelted chondritic particles have densities ranging between 0.3 and 6.2 g/cu cm, averaging 2.0 g/cu cm. The low medium densities indicates appreciable porosity, suggesting primitive, uncompacted parent bodies for these particles. Porosities greater than 70% are rare. IDPs with densities above 3.5 g/cu cm usually contain large sulfide grains. We find no evidence of bimodality in the unmelted particle density distribution. Chondritic spherules (melted particles) have densities near 3.4 g/cu cm, consistent with previous results for stony spheurles culled from deep-sea sediments.
Brownlee Donald E.
Joswiak David J.
Love Stanley G.
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