Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1397w&link_type=abstract
Lunar and Planetary Science, volume 27, page 1397
Other
Chondrules, Planetesimals, Solar Nebula
Scientific paper
It is widely believed that chondrules were formed in the solar nebula by transient heating events that melted precursor aggregates of dust grains. The nature of the heating events is unclear, but one persistent suggestion is some sort of electrostatic discharge or "lightning". This idea is attractive because the formation of planetesimals involved settling of particles into a dense layer in the central plane of the nebula. This layer provided an environment with high solids/gas ratio, high opacity, and potentially high concentration of precursor aggregates. Moreover, this dense dusty layer was turbulent due to shear relative to the nebular gas. Such a turbulent dusty environment offers the prospect of charge separation and generation of electrical discharges of some sort. However, arguments for and against lightning remain inconclusive because of limited understanding of the generation of terrestrial lightning and difficulties of scaling such processes to very different conditions in the solar nebula. In the present work I report on efforts to place other constraints on the chondrule-forming process in this context from models of particle settling and coagulation during the formation of planetesimals. Assuming "lightning" can occur, are other conditions met? Can shear-generated turbulence provided enough energy? Does particle coagulation produce sufficient precursor aggregates of the appropriate size? Are chondrules concentrated or sorted aerodynamically, and accreted efficiently into planetesimals?
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