The spatial distribution and time evolution of impact-generated magnetic fields

Details The spatial distribution and time evolution of impact-generated magnetic fields The spatial distribution and time evolution of impact-generated magnetic fields

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..382c&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 382-383 (SEE N92-10728 01-91)

Physics

Craters, Impact Damage, Magnetic Field Configurations, Magnetic Fields, Plasmas (Physics), Spatial Distribution, Time Dependence, Vapors, Electron Density (Concentration), Electron Energy, Electrostatic Probes, Images, Photography, Pressure Measurement, Targets, Temperature Gradients, Vaporizing

Scientific paper

The production of magnetic fields was revealed by laboratory hypervelocity impacts in easily vaporized targets. As quantified by pressure measurements, high frame-rate photography, and electrostatic probes, these impacts tend to produce large quantities of slightly ionized vapor, which is referred to as impact-generated plasma. Nonaligned electron density and temperature gradients within this plasma may lead to production of the observed magnetic fields. Past experiments were limited to measuring a single component of the impact-generated magnetic fields at only a few locations about the developing impact crater and consequently gave little information about the field production mechanism. To understand this mechanism, the techniques were extended to map the three components of the magnetic field both in space and time. By conducting many otherwise identical experiments with arrayed magnetic detectors, a preliminary 3-D picture was produced of impact-generated magnetic fields as they develop through time.

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