Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1063n&link_type=abstract
In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1063-1064 (SEE N94-20636 05-91
Physics
1
Erosion, Gas Expansion, Geomagnetism, Hypersonics, Hypervelocity Impact, Impact Damage, Ionization, Kinetic Energy, Magnetohydrodynamic Flow, Meteoritic Damage, Nuclear Explosions, Plasmas (Physics), Vaporizing, Air Jets, High Speed, Jet Flow, Mathematical Models, Vapors
Scientific paper
The impact of a large cosmic body with typical size R approximately = 1 km (mass M approximately = 4-10 Gt for a stony or icy body) moving with velocity V approximately = 50-70 km/s (kinetic energy of the order of 10 exp 21 J or 10 exp 6 Mt of TMT) on the Earth's surface leads to a full vaporization of a body and of a significant part of substance of the upper layers of the Earth and even to the ionization of this vapor cloud. As a result, a hypersonic jet of air and erosion plasma is formed. The kinetic energy EJ is far above the total energy of the geomagnetic field of the Earth (approximately equivalent to the energy of 100 Mt) and the total mass of a fast-moving part of the jet Mj approximately = 10 exp 12 kg is far above the mass of atmosphere in the jet expansion cone. Thus, the jet will propagate practically inertially with the constant mean velocity U approximately = 10-20 km/s and even higher. The interaction of this plasma jet with the Earth's magnetic field causes magnetodynamic effects similar to those which are produced by cosmic nuclear explosions but of a larger scale. The preliminary results of experimental and numerical modeling of the plasma jet-magnetosphere interaction are presented.
Alexandrov P. E.
Artemiev V. I.
Bergelson V. I.
Nemchinov I. V.
Rybakov A. V.
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