Magnetic effects of large-scale impacts on airless planetary bodies

Details Magnetic effects of large-scale impacts on airless planetary bodies Magnetic effects of large-scale impacts on airless planetary bodies

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..379h&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 379-381 (SEE N92-10728 01-91)

Physics

Geophysics

Hypervelocity Impact, Lunar Geology, Magnetic Effects, Magnetic Fields, Magnetization, Planetary Surfaces, Plasma Interactions, Silicates, Space Plasmas, Earth Crust, Magnetic Anomalies, Magnetohydrodynamic Flow, Mathematical Models, Moon, Paleomagnetism, Solar System, Solar Wind, Structural Basins

Scientific paper

The analysis of lunar orbital and sample data combined with laboratory measurements of impact-produced plasmas suggest that large-scale impacts on planetary surfaces may have had significant magnetic effects. These effects may potentially explain part of all lunar crustal magnetization and, by extension, may be responsible for producing paleomagnetism on other airless silicate bodies in the solar system. Theoretical studies are presented of the magnetic field and remanent magnetization effects of basin-scale impacts on the Moon. The specific case of a Moon exposed to the solar wind plasma flow and its embedded magnetic field is investigated. It is shown that maximum compressed field amplitudes occur antipodal to the impact point in agreement with the observed tendency for orbital magnetic anomalies to be concentrated antipodal to young large lunar basins. Generalization of these results to include magnetic effects of impacts on other airless or nearly airless bodies in the solar system is presented.

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