Precursor-shock propagation in a well-characterized thermal layer

Details Precursor-shock propagation in a well-characterized thermal layer Precursor-shock propagation in a well-characterized thermal layer

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppgtp145m&link_type=abstract

American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #gTuaP145.

Physics

Plasma Physics

Scientific paper

A thermal shock precursor forms when a shock wave propagating through ambient air encounters a layer of hot gas whose sound speed is higher than the sound speed in the ambient. Precursor shocks are thought to play a role during explosive breakup of meteorites in the atmosphere, high-velocity impact of cosmic bodies on planetary surfaces, and in the interaction of interplanetary shocks with the geomagnetic tail. Some have even suggested harnessing artificially induced precursors to alter the trajectories of small but dangerous asteroids entering the earth's atmosphere. We present an experiment that measured the behavior of a shock precursor in a well-characterized, thin thermal layer above a 3000(K hot surface. A laser pulse focused onto a thin solid target produced the shock, eliminating interference from explosion products. Precursor and thermal layer characteristics were measured using spectroscopy, interferometry, and dark-field shadowgraphy. The results will be compared to theoretical calculations.

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