Other
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15..211h&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Other
10
Hypervelocity Impact, Lunar Magnetic Fields, Lunar Surface, Meteorite Collisions, Paleomagnetism, Dynamo Theory, Gas Expansion, Lunar Evolution, Plasma Interactions, Moon, Magnetic Fields, Velocity, Meteoroids, Impacts, Paleomagnetism, Magnetic Properties, Core, Dynamo Theory, Hypotheses, Origin, Size, Magnetization, Models, Diffusion, Energy, Time Scale, Conductivity, Electrical Effects, Amplitude, Pressure
Scientific paper
A one-dimensional numerical model for the expansion of impact-produced vapor clouds is used to investigate magnetic field generation mechanisms in events such as meteor collisions with the moon. The resulting cloud properties, such as ionization fraction, electrical conductivity, radial expansion velocity, mass density, and energy density are estimated. The model is initiated with the peak shock states and pressure thresholds for incipient and complete vaporization of anorthosite lunar surface materials by iron and GA composition meteorites. The expansion of the spherical gas cloud into a vacuum was traced with a one-dimensional explicit lagrangian hydrodynamic code. The hypervelocity impact plasmas produced are found to be significant in the amplitudes and orientations of the magnetic fields generated. An ambient magnetic field could have been provided by the core dynamo, which would have interacted with the expanding plasmas and formed induced paleomagnetic fields. Several other field-contribution mechanisms are discussed and discarded as potential remanent magnetism contributors.
Hood Lon L.
Vickery Ann
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