Recent Advances in Bolide Entry Modeling:A Bolide Potpourri* |
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| Authors: | D O ReVelle |
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| Institution: | (1) Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA |
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| Abstract: | In this paper, we will review recent research on numerous aspects of bolide entry into a planetary atmosphere, including such
topics as the entry dynamics, energetics, ablation, deceleration, fragmentation, luminosity, mechanical wave generation processes,
a total (panchromatic) power budget including differential and integral efficiencies vs. time, etc. Fragmentation, triggered
by stagnation pressures exceeding the bolide breaking strength, has been included with subsequent wake behavior in either
a collective or non-collective behavior limit. We have also utilized the differential panchromatic luminous efficiency of
ReVelle and Ceplecha (2002c, Proceedings of Asteroids, Comets, Meteors ACM 2002, 29 July–2August, 285–288) to compute bolide luminosity. In addition we also introduce the concept of the differential and
integral acoustic/infrasonic efficiency and generalized it to the case of mechanical wave efficiency including internal atmospheric
gravity waves generated during entry. Unlike the other efficiencies which are assumed to be a constant multiple of the luminous
efficiency, the acoustic efficiency is calculated independently using a 'first principles' approach. All of these topics have
been pursued using either a homogeneous or a porous meteoroid model with great success. As a direct result, porosity seems
to be a rather good possibility for explaining anomalous meteoroid behavior in the atmosphere. |
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