C. P. Haynes¹ and C. Millet²

¹UMR 7600, CNRS/Université Pierre et Marie Curie, Paris, France
²CEA, DAM, DIF, Arpajon, France

We perform a multicomponent sensitivity analysis of how the physical and dynamical parameters that characterize a meteor (in-fall) affect the ground overpressure and period of a plausible emitted N-wave signal. The nonlinear propagation model used throughout is based upon Whitham’s nonlinearization method which is modified to take into account a stratified atmosphere. We use sensitivity indices, derived using a Fourier Amplitude Sensitivity Test, to measure how the meteor parameters’ uncertainties affect the uncertainty in the overpressure and period of an emitted N-wave. The investigated parameters include the azimuth, entry angle, diameter, drag coefficient, density, and initial velocity of the meteor, as well as the atmosphere. The method is used to re-examine the crater-forming meteorite fall near Carancas, Peru (2007). We obtain good agreement between the simulated signals and observed waveforms. It is shown that ground overpressure uncertainty depends on the atmospheric uncertainties that are strongly correlated with the unknown trajectory, whereas the period is governed by the diameter uncertainties. Finally, we consider new waveform parameters that help characterize the meteor.

Reference
Haynes CP and Millet C (in press) A sensitivity analysis of meteoric infrasound. Journal of Geophysical Research – Planets, 118
[doi:10.1002/jgre.20116]
Published by arrangement with John Wiley & Sons

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