Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...89...26l&link_type=abstract
Icarus (ISSN 0019-1035), vol. 89, Jan. 1991, p. 26-43.
Physics
167
Atmospheric Entry, Atmospheric Heating, Earth Atmosphere, Micrometeoroids, Phase Transformations, Atmospheric Density, Interplanetary Dust, Melting Points, Size Distribution, Asteroids, Micrometeroids, Heating, Thermal Effects, Earth, Particles, Idps, Interplanetary Dust, Ablation, Parameters, Cooling, Density, Velocity, Gravity Effects, Melting, Size, Temperature, Atmosphere, Simulations, Models, Calculations, Size Distribution, Organic Material
Scientific paper
The present numerical solutions for the atmospheric entry of 10 micron-1 mm diameter micrometeoroids gave attention to ablative mass loss and cooling, together with gravitational and curvature effects, for entry velocities in the 11.2-72 km/sec range. Maximum temperature and mass-loss rates are found to generally occur at altitudes between 85 and 90 km, during about 1 sec of peak heating; the survival of all particles in the 70 micron-1 mm size range is noted to be limited to those with minimal entry velocity. Virtually all of the 'cosmic spherules' of more than 70-mm diameter, as well as giant unmelted micrometeorites, are implied by the present results to be of asteroidal origin.
Brownlee Don E.
Love Stanley G.
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