Physics
Scientific paper
Oct 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965jatp...27.1045b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 27, no. 10, pp. 1045-1048, IN7-IN8, 1049-1053
Physics
Scientific paper
It has been suggested from theoretical considerations that for lightning discharges with two or more return strokes to ground, the radiation spectra of first and subsequent strokes at very low frequencies may differ in a systematic way. Existing records of atmospherics on frequencies of 6 kc/s and 10 kc/s from near storms at Slough, England, taken as part of a general programme of measurement of lightning source radiation, have been examined for any such systematic differences. Marked variations of the ratios of the amplitudes of the atmospherics on these frequencies were observed from one return stroke to another in the same discharge, these being attributed in the main to the differing lengths and orientations of the discharge channels, and to random differences in the current waveforms. Two samples of atmospherics were considered in an attempt to detect the rather small systematic effects predicted by the theory; both indicated that it is unlikely that systematic differences of the order forecast occur.
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