Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.372..735c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 2, pp. 735-740.
Astronomy and Astrophysics
Astronomy
1
Meteors, Meteoroids, Ism: Kinematics And Dynamics
Scientific paper
The recovery of discrete amounts of biotic material in the Earth's upper atmosphere raises the question of the detailed dynamics of these particles during atmospheric air breaking. Earlier work has discussed the possibility that these particles are slowed by the sputtering of surface molecules. The mechanics of sputtering are examined to take account of the scattering of molecules back on to the surface of a meteoroid. It is found that when the meteoroid radius is of the order of the mean free path of the surrounding atmosphere, backscattering can account for around a sixth of the drag, for meteoroid velocities <1kms-1.
The effects of backscattering are not significant for the direct entry of micron-sized particles into the atmosphere as these are decelerated at altitudes where the atmospheric mean free path is much greater than the particle's radius. Backscattering effects do appear to be significant, however, when considering the drag force acting on a micron-sized particle moving through the atmosphere at a settling speed of the order of cms-1.
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