Impact cratering on Venus: ballistic hole in the atmosphere

Details Impact cratering on Venus: ballistic hole in the atmosphere Impact cratering on Venus: ballistic hole in the atmosphere

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..341i&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

Abstract Study of Venusian impact craters has started during Venera 13/14 and Magellan missions. The presence of ejecta deposits beyond the crater rim has been observed. The explanation was proposed that ballistic shock waves in a dense atmosphere create a transient hot "fireball" of low density hot gases [1]. Ejecta may leave the crater through the low density gas. The presentation returns back to this idea and presents results of numerical modelling of the process. The hydrocode simulate in a single run the projectile atmospheric passage and the excavation stage of cratering. Preliminary modelling results confirm early analytical estimates of the low density size and time of closing, which allow ejecta to be deposited well outside the crater rim.

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