Physics
Scientific paper
Jan 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963jatp...25...35w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 25, no. 1, pp. 35-38, IN5, 39-41
Physics
Scientific paper
Since the radiation field of a lightning discharge is proportional to the second derivative of the thundercloud moment, while the electrostatic field, directly to the moment, atmospherics, both day-tune and night-time, with their first half-waves positive-going will indicate a downward movement of negative charge or an upward movement of positive charge, and those with their first half-waves negative-going, a movement of charge in the opposite direction. Thus a dart and a stepped downward streamer, and the upward return stroke will all give positive-going atmospheric waveforms, while an upward developing stepped or dart streamer will give negative-going waveform. Differentiation of atmospherics due to these three types of streamers (stepped, dart and return) may be made from the general shape of their waveforms, whether simple or complex, and to some extent from the relative wave amplitudes and the length of the train. The correctness of the sign interpretation was verified by the results obtained from analysing nearly 2000 atmospheric waveforms with the initial portions of their first waves clearly delineated. The interpretation given thus offers the possibility of classifying eventually the atmospheric waveforms according to their originating discharges.
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