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Balachandran 1983
Balachandran, N.K. (1983). Acoustic and electric signals from lightning. Journal of Geophysical Research 88: doi: 10.1029/JC088iC06p03879. issn: 0148-0227.

Observations of infrasound apparently generated by the collapse of the electrostatic field in the thundercloud, are presented along with electric field measurements and high-frequency thunder signals. The frequency of the infrasound pulse is about 1 Hz and amplitude a few microbars. The observations seem to confirm some of the theoretical predictions of Wilson (1920) and Dessler (1973). The signal is predominated by a compressional phase and seems to be beamed vertically. Calculation of the parameters of the charged region using the infrasound signal give reasonable values.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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