Computer Science – Performance
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1119r&link_type=abstract
Lunar and Planetary Science, volume 27, page 1119
Computer Science
Performance
Dust, Dust Storms: Martian, Impacts, Mars, Meteoroids
Scientific paper
A hypothesis has been proposed in that the impacts of small cosmic bodies on the planet's; surface may trigger local sand storms due to the formation of a heated layer over the ground under thermal radiation. The interaction of the shock wave with the heated layer leads to initiation of large-scale vortex flow and high-speed jets moving along the surface. This flow may be responsible for the intense dust lifting even in the case when a small cosmic body does not directly hit the ground and creates an explosion above the surface. Several other factors of the impact can also facilitate a dust rising: outgassing of the porous surface layer under heating by the radiation impulse; intrusion of the shock-compressed atmospheric gas into the regolith and subsequent blow-off in the rarefaction wave; steep erosion by blast-generated high-velocity winds. The generation of large-scale vortex flows in interaction of the blast wave with the ballistic wave and the wake behind a falling body may also cause a lifting of dust particles to high altitude and its long-distant transport. All these effects are especially effective for the impact on Mars when the luminous performance and the fireball size highly exceed these for the impacts on the Earth or Venus. A thorough investigation of the possible impact origin of local sand storms on Mars becomes even more interesting if we keep in mind that now there is no well and widely recognized mechanism of dust rising. We have made studies on impact-generated dust lifting and transport in numerical simulations and laboratory experiments.
Artemiev V. I.
Medveduk S. A.
Nemtchinov Ivan V.
Rybakov A. V.
Shuvalov Valery
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