Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..867c&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.867
Physics
Scientific paper
The solar heating causes non-homogeneous temperature field and associated thermal stress inside meteoroids. In the solar vicinity, the thermal stress may override the material strength and meteoroids begin to crack. The destruction of meteoroids begins from the surface and we assume that the fractured material is removed from the surface, which leads to decrease of meteoroid size. The thermal stress is therefore able to change the initial size distribution of a meteoroid stream with sufficiently low perihelion according to material properties of the meteoroids (in particular the tensile strength). We developed a simplified model describing this phenomenon and applied it to Geminids. We found that the thermal stress is able to preferentially remove larger and weaker members of the stream. This may explain the higher mechanical strength observed during their passage through the atmosphere. Our model predicts that resulting meteoroid population should contain larger bodies with high strength and smaller bodies with wider range of mechanical strengths. As a result, we believe that the influence of the thermal stress may explain the unusual mechanical properties of Geminids.
Čapek David
Vokrouhlicky David
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