An Analytical Model of Meteoroid Entry into Planetary Atmospheres

Physics

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Atmospheres: Planetary, Fireballs, Meteoroids: Entry, Plumes, Shoemaker-Levy 9

Scientific paper

Understanding the mechanisms of kinetic energy loss during meteoroid traversal of planetary atmospheres is crucial for understanding the development of fireballs and plumes that were observed during the impact of Comet Shoemaker-Levy 9 on Jupiter and entry events in Earth's atmosphere. Analytical models of the deceleration, ablation, deformation and breakup of meteoroids during passage through planetary atmospheres have been proposed and refined by many researchers. Here, a modified ablation model is proposed that properly satisfies conservation of energy during the ablative process and can be reconciled with observations of terrestrial meteors. A new analytical hydrodynamic deformation model, based on an observation of O'Keefe et al., compares favorably with numerical simulations performed using the CTH shock-physics code. Coupling the new hydrodynamic model to the modified ablation model yields a model that describes meteoroid entry over a wide range of velocities and spatial scales.

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