For the full PDF file:
http://eprintweb.org/S/article/astro-ph/0712.0561
http://eprintweb.org/S/article/astro-ph/0712.0561
arXiv:0712.0561 (December 2007)
Exposing metal and silicate charges to electrical discharges: Did chondrules
form by nebular lightning?
C. Güttler, T. Poppe, J. T. Wasson and J. Blum
Institut für Geophysik und extraterrestrische Physik, Technische Universität
Braunschweig
Institute of Geophysics and Planetary Physics, University of California, Los
Angeles
Received. 04 December 2007 Last updated. 04 December 2007
Abstract. In order to investigate the hypothesis that dust aggregates were
transformed to meteoritic chondrules by nebular lightning, we exposed silicatic
and metallic dust samples to electric discharges with energies of 120 to 500 J
in air at pressures between 10 and 10^5 Pa. The target charges consisted of
powders of micrometer-sized particles and had dimensions of mm. The dust
samples generally fragmented leaving the major fraction thermally unprocessed.
A minor part formed sintered aggregates of 50 to 500 micrometer. In a few
experiments melt spherules having sizes smaller than 180 micrometer in diameter
(and, generally, interior voids) were formed; the highest spherule fraction was
obtained with metallic Ni. Our experiments indicate that chondrule formation by
electric current or by particle bombardment inside a discharge channel is
unlikely.
Categories. astro-ph
Comment. Accepted by Icarus
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