The pressure spectrum of the sonic‐boom N wave is simply given by , where T is the boom duration, P(T) is the pressure amplitude, and j1(ωT/2) is a spherical Bessel function of the first kind and order. The effective acoustic period of the N wave is approximately times its duration. The present formulation is a simplification of those by Crocker and Young. The spectrum formula given by Zepler and Harel is incomplete.
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July 21 2005
Farfield Spectrum of the Sonic Boom
Walton L. Howes; Farfield Spectrum of the Sonic Boom. J. Acoust. Soc. Am. 1 March 1967; 41 (3): 716–717. https://doi.org/10.1121/1.1910402
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