New calibration of the micrometeoroid flux on the Earth

Details New calibration of the micrometeoroid flux on the Earth New calibration of the micrometeoroid flux on the Earth

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..455b&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.455

Physics

Scientific paper

The micrometeoritic flux on Earth derived by [5] from cratering data on the Long Duration Exposure Facility (LDEF) has to be revised in light of the new estimates of the impact velocity of particles and updated scaling laws for hypervelocity impacts derived from hydrocodes. We have obtained wew values of the impact velocity with a numerical approach that models the evolution of dust particles, of asteroidal and cometary origin, in the proximity of the Earth ([2]). The hydrocode iSALE is instead used to derive an appropriate scaling law relating the diameter of a crater on an aluminum alloy target, like the LDEF facility, to the projectile size. Different values of grain porosity and density are used depending on the origin of the dust grains.

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