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A sensitivity analysis of meteoric infrasound
Author(s) -
Haynes C. P.,
Millet C.
Publication year - 2013
Publication title -
journal of geophysical research: planets
Language(s) - English
Resource type - Journals
eISSN - 2169-9100
pISSN - 2169-9097
DOI - 10.1002/jgre.20116
Subject(s) - overpressure , meteor (satellite) , sensitivity (control systems) , waveform , amplitude , infrasound , geology , trajectory , meteoroid , atmosphere (unit) , azimuth , mechanics , meteorology , environmental science , physics , acoustics , optics , astrobiology , quantum mechanics , voltage , electronic engineering , astronomy , engineering , thermodynamics
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.