Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...749l..40c&link_type=abstract
The Astrophysical Journal Letters, Volume 749, Issue 2, article id. L40 (2012).
Astronomy and Astrophysics
Astronomy
Earth, Meteorites, Meteors, Meteoroids, Methods: Numerical
Scientific paper
Mass accretion rate on Earth is an important tool to discriminate the extraterrestrial nature of particles or isotopes found in different environments on the ground. In this context, the knowledge of the micrometeoroid flux arriving in our atmosphere is a key parameter and it needs to be calibrated. We provide a new calibration of the flux of submillimeter particles impacting the Earth in the mass range from 10–9 to 10–4 g, derived by computing a specific scaling law for impact craters on the Long Duration Exposure Facility (LDEF). We use the hydrocode iSALE to calculate the outcome of impacts on LDEF, adopting realistic impact velocities for dust particles derived from the numerical integration of their trajectories assuming either asteroidal or cometary origin. We estimate a particle mass accretion rate of (7.4 ± 1.0) × 106 kg yr–1 if the Main Belt is assumed as the major source of dust, while it reduces to (4.2 ± 0.5) × 106 kg yr–1 if cometary dust dominates. These values agree with the estimates provided by independent measurements made on ice core and ocean sediments and based on the abundance of some elements in the samples.
Borin Patrizia
Bruno Marco
Cremonese Gabriele
Martellato Elena
Marzari Francesco
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