| ABSTRACT
Benjamin Franklin first
speculated that electrical forces might participate in the
production of thunder during electrical storms. We have come full
circle in the investigation of the infrasonic portion of thunder and
its association with thundercloud electrostatics. In this talk I will
review the phenomenology of the lightning stroke that produces the
audible component of thunder. Theoretical models and experimental
measurements agree that most of the acoustic energy associated with
the lightning stroke lies at frequencies above 100 Hz. At frequencies
below 10 Hz the situation becomes more complicated and sources of the
infrasonic portion of the spectrum appear to be associated with the
redistribution of the charge within the thundercloud. Finally, I will
review recent observations of infrasound signals that have been found
to be associated with Sprite events.
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