Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..844h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 14, Aug. 1987, p. 844-847.
Physics
21
Hypervelocity Impact, Lunar Crust, Lunar Magnetic Fields, Lunar Surface, Magnetic Effects, Structural Basins, Magnetic Anomalies, Plasma Clouds, Moon, Impacts, Magnetic Fields, Remanent Magnetization, Concentration, Crust, Basins, Imbrium, Mare, Orientale, Serenitatis, Srm, Crisium, Models, Hypervelocity, Shock Effects, Hydrodynamics, Thermal Effects, Diagrams, Amplitude, Compression
Scientific paper
Maps of the distribution of lunar surface magnetic fields produced by the electron reflection method have shown that the largest observed concentrations of lunar crustal magnetization occur antipodal (diametrically opposite) to four relatively young large impact basins: Imbrium, Orientale, Serenitatis, and Crisium. A model is proposed here for the formation of these magnetization concentrations (or 'magcons') in which the partially ionized vapor cloud produced in a hypervelocity (greater than 10 km/s) basin-forming impact expands around the moon forcing a preexisting ambient magnetic field to be concentrated for a brief (less than 1 day) time period in the antipodal zone. Acquisition of magnetic remanence during the period of compressed field amplification may occur by one of several mechanisms, such as shock remanence by impact of solid secondaries ejected from the basin-forming event. The model implies that basin-forming impacts have played a major role in determining the large-scale distribution of crustal magnetization detectable from lunar orbit.
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