AE31A-0421
Acoustic Properties of Return Strokes and M-components From Rocket-Triggered Lightning

Wednesday, 16 December 2015
Poster Hall (Moscone South)
Maher A Dayeh, Southwest Research Institute San Antonio, San Antonio, TX, United States, Stephen A Fuselier, Southwest Research Institute, San Antonio, TX, United States, Joseph R Dwyer, University of New Hampshire Main Campus, Department of Physics, Durham, NH, United States, Martin A Uman, Univ Florida, Gainesville, FL, United States, Douglas Jordan, University of Florida, Ft Walton Beach, FL, United States, Felipe Lenz Carvalho, University of Florida, Electrical and Computer Engineering, Ft Walton Beach, FL, United States and Hamid Rassoul, Florida Inst Tech, Melbourne, FL, United States
Abstract:
Using a linear, one-dimensional array of 15 microphones situated 95 meters from the lightning channel; we measure the acoustic signatures from 11 triggered-lightning events comprising 41 return strokes and 28 M-components. Measurements were taken at the International Center for Lightning Research and Testing (ICLRT) in Camp Blanding, FL during the summer of 2014.

Recently, we reported that beamforming signal processing enables acoustic imaging of the lightning channel at high frequencies (Dayeh et al. 2015). Following up on the work, we report on the characteristics of the acoustic measurements in terms of sound pressure amplitude, peak currents, power spectral density (PSD) properties, and the inferred energy input. In addition, we find that M-component do not create acoustic signatures in most occasions; we discuss these cases in context of the associated current amplitude, rise time, and background continuing current.

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