Finite-size corrections to the atmospheric heating of micrometeorites

Details Finite-size corrections to the atmospheric heating of micrometeorites Finite-size corrections to the atmospheric heating of micrometeorites

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.402.1208b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 2, pp. 1208-1212.

Astronomy and Astrophysics

Astronomy

Radiation Mechanisms: Thermal, Meteors, Meteoroids

Scientific paper

We investigate the heating of micrometeorites and dust particles, as they decelerate in the Earth's upper atmosphere, when finite-size correction effects to the Stefan-Boltzmann surface reradiation law apply. For particles smaller than about 25 μm across, it is found that the finite-size corrections result in significantly lower maximum temperatures being realized. Indeed, the finite-size correction to the Stefan-Boltzmann law acts in the opposite sense to that of a reduced radiative efficiency which tends to increase the temperature of small meteoroids. It is also found that the accumulated thermal processing during atmospheric deceleration is greatly reduced when finite-size correction effects become important and this may have important consequences for the loss of volatile elements, as well as any petrographic alterations that a dust particle may experience.

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