Atmospheric transmission of polar meteorites

Details Atmospheric transmission of polar meteorites Atmospheric transmission of polar meteorites

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9323206b&link_type=abstract

Atmospheric transmission of polar meteorites Transl. into ENGLISH of Transmission Atmospheriquedes Micrometeorites Polaires et I

Biology

Ablation, Atmospheric Entry, Exobiology, Micrometeorites, Particles, Rarefied Gases, Computer Programs, Digital Simulation, Mathematical Models, Polar Regions

Scientific paper

The current theory is reviewed, as concerns both the aerodynamic field and the material thermal reaction field, and a law governing the vaporization from a mixture of melted oxides is developed. The effect of an organic compound on heating and pyrolysis is analyzed accurately with a computer program that simulates the entire process of ablation of a charforming material. A program to simulate the complete micrometeorite atmospheric entry trajectory, including melting, porosity change, loss of an organic component and vaporization of the major elements of the mineral component was applied over the entire range of micrometeorite velocities and angles of entry. The entry corridor required for each of the three characteristics of the polar micrometeorites is evaluated. After weighting the angle and velocity allowed for each corridor, an entry velocity distribution compatible with actual polar micrometeorite characteristics is found by comparing computer generated data with 'experimental' data. The origin of polar micrometeorites and the part they may have played in bringing organic matter to the early Earth is discussed.

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