RF radiation produced by intracloud lightning discharges

The RF radiation produced during intracloud lightning flashes is presented, together with associated fast and slow electric field changes. These data were collected during the Thunderstorm Research International Project in Florida during the summer of 1977. The RF radiation is essentially simultaneous with the fast-field change but has a tendency to peak during the initial half-cycle of the bipolar field changes associated cloud processes. This is in marked contrast to previous observations of RF radiation during return strokes in cloud-to-ground discharges and provides a clue to the physics of the intracloud discharge.