Fireball dynamics, energetics, ablation, luminosity and fragmentation modeling

Details Fireball dynamics, energetics, ablation, luminosity and fragmentation modeling Fireball dynamics, energetics, ablation, luminosity and fragmentation modeling

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..127r&link_type=abstract

In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed

Physics

2

Fireballs: Models

Scientific paper

We have modeled large bolide passage through the Earth's atmosphere including the effects of dynamics, energetics, ablation, luminosity and fragmentation, including bolide porosity. In this brief paper we outline the physical processes involved in only a schematic manner. Bolide luminosity was assumed to be proportional to the time rate of change of the kinetic energy. Recently, the proportionality factor (which varies with mass, height and velocity), a semi-empirical differential luminous efficiency, has been produced using the Lost City meteorite fall as a calibration event. Two schemes of fragmentation have been devised for the prediction of bolide luminosity. In the first scheme, fragmented particles are deposited into the wake after triggering by the stagnation pressure exceeding the bolide strength and these particles remain in the wake. In the second scheme, the fragmented particles are drawn forward collectively to produce an enhanced frontal area as time progresses. Considerable success was found in modeling the light curve of the Benesov bolide. The full paper with all relevant details and many additional cases will be submitted shortly to Icarus for formal publication.

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