Other
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981avest..14..210k&link_type=abstract
(Astronomicheskii Vestnik, vol. 14, Oct.-Dec. 1980, p. 210-215.) Solar System Research, vol. 14, no. 4, Apr. 1981, p. 166-172. T
Other
Atmospheric Entry, Drops (Liquids), Earth Atmosphere, Meteoroids, Bodies Of Revolution, Deformation, Ellipsoids, Evaporation, Gas Dynamics, Geminid Meteoroids, Iron Meteorites, Molting, Orionid Meteoroids, Penetration, Perseid Meteoroids, Stony Meteorites, Tensile Stress
Scientific paper
Possible observational effects related to the deformation and break-up of molten meteors in the earth's atmosphere are considered. The critical Weber number characterizing the ratio of aerodynamic pressure to surface tensile stress at which a liquid droplet in a gas flow breaks up into a number of smaller droplets is examined, and it is shown that under meteoric conditions, a droplet may not break up into more than two fragments and thus not produce a flare at the end of the brightness curve. The problem of the passage of a molten meteor through the atmosphere is then formulated in terms of the propagation of an oblate ellipsoid of revolution, taking into account longitudinal and transverse surface tensile stresses, aerodynamic pressure, drop evaporation and the change of density of an isothermal atmosphere. Brightness curves obtained by a numerical solution of the problem are found to be identical for stony and iron meteorites, with penetration depth independent of initial mass for a given critical Weber number. Comparison of the calculated limiting penetration depths for a liquid meteor with observations of the Geminid, Orionid and Perseid meteor showers indicates that completely molten meteoroids are too small to experience deformation sufficient for intense break-up.
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